LED lamp bead and circuit control system

Abstract

The utility model provides an LED lamp bead and a circuit control system, and belongs to the technical field of display, and the LED lamp bead comprises a plurality of LED units connected in parallel, each LED unit comprises at least two miniature LEDs which are connected in series and have the same color, and the LED units connected in parallel are fixed on a circuit substrate. And an electrical pin bonding pad is arranged at the communication part of the positive electrodes and the negative electrodes of at least two adjacent light-emitting diodes in the middle of the LED unit. According to the LED lamp bead, the at least two light emitting diodes with the same color are connected in series to obtain the LED unit, so that the LED unit can present brightness of different degrees, and the LED lamp bead can be applied to various brightness scenes. The LED units with different colors are connected in parallel to form the LED lamp bead, so that the colors of the LED lamp bead are enriched, and the LED lamp bead can present various colors.

Description

Technical Field

[0001] This application relates to the field of display technology, and particularly to an LED lamp bead and a circuit control system. Background Art

[0002] As the application scenarios of LED displays become more and more extensive. The demand for small-pitch and micro-pitch products of outdoor LED displays is increasing for outdoor street advertisements and all-in-one machines. In order to ensure rich and clearly visible display images of outdoor LED displays, requirements for the brightness of LED displays are also put forward.

[0003] The existing LED lamp beads and the control circuits of LED lamp beads are not suitable for different brightness scenarios. Summary of the Utility Model

[0004] This application provides an LED lamp bead 10 and a circuit control system to solve the problem that the existing LED lamp bead 10 and the control circuit of the LED lamp bead 10 are not suitable for different brightness scenarios, and to enable the LED lamp bead 10 and the circuit control system to adapt to different brightness scenarios.

[0005] This application provides an LED lamp bead, including: a plurality of parallel-connected LED units, each of the LED units includes at least two serially-connected light-emitting diodes of the same color, the plurality of parallel-connected LED units are fixed on a circuit board, and electrical pin pads are provided at the connection points of the positive and negative electrodes of at least two adjacent light-emitting diodes in the middle of the LED unit.

[0006] According to the LED lamp bead provided by this application, the plurality of parallel-connected LED units include at least two colors of LED units.

[0007] According to the LED lamp bead provided by this application, in the LED unit, an electrical pin pad is provided at the positive electrode of the light-emitting diode arranged at the starting position, and the electrical pin pad is provided at the negative electrode of the light-emitting diode arranged at the end position.

[0008] This application also provides a circuit control system, including at least one of the above-mentioned LED lamp beads, a first control circuit, a second control circuit, and a power supply switching circuit. The first control circuit is connected to the plurality of LED units and the power supply switching circuit, the second control circuit is connected to the plurality of light-emitting diodes and the power supply switching circuit, and at least one of the light-emitting diodes in each LED unit is connected to the second control circuit.

[0009] According to the circuit control system provided by the present application, the first control circuit includes a first row transistor driving circuit, the second control circuit includes a second row transistor driving circuit, and the circuit control system of the LED lamp beads further includes a plurality of constant current driving circuits, and each of the constant current driving circuits is connected to an LED unit of the same color and a ground pin.

[0010] According to the circuit control system provided by the present application, the first control circuit includes a first constant current driving circuit group, the second control circuit includes a second constant current driving circuit group, the circuit control system of the LED lamp beads further includes a row transistor driving circuit, and the first constant current driving circuit group or the second constant current driving circuit group includes a plurality of constant current driving circuits, and each of the constant current driving circuits is connected to an LED unit of the same color and the power supply switching circuit.

[0011] According to the circuit control system provided by the present application, the power supply switching circuit includes a first power supply unit and a second power supply unit, the first power supply unit is connected to the first control circuit, and the second power supply unit is connected to the second control circuit.

[0012] According to the circuit control system provided by the present application, the power supply switching circuit further includes a pulse width modulation (PWM) unit, a first field effect transistor, a second field effect transistor, and a triode. The first field effect transistor is connected to the first power supply unit and the first control circuit, the second field effect transistor is connected to the second power supply unit and the second control circuit, the triode is connected to the PWM unit, the first power supply unit, and the ground pin, and the PWM unit is connected to the second power supply unit.

[0013] According to the circuit control system provided by the present application, it further includes a light sensor, and the light sensor is connected to the PWM unit.

[0014] According to the circuit control system provided by the present application, it further includes a first resistor, a second resistor, and a third resistor. The first resistor is connected to the triode and the first power supply unit, the second resistor is connected to the PWM unit and the second power supply unit, and the third resistor is connected to the PWM unit and the triode 12.

[0015] The LED lamp beads and circuit control system provided by this application include: multiple parallel-connected LED units. Each LED unit includes at least two serially-connected light-emitting diodes of the same color. The multiple parallel-connected LED units are fixed on a circuit substrate, and electrical pin pads are provided at the connection points of the anodes and cathodes of at least two adjacent middle light-emitting diodes in the LED unit. By connecting at least two light-emitting diodes of the same color in series to obtain an LED unit, different levels of brightness can be presented by the LED unit, enabling the LED lamp beads to be applied to various brightness scenarios. By connecting different-color LED units in parallel to obtain an LED lamp bead, the colors of the LED lamp beads are enriched, enabling the LED lamp beads to present various colors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the LED lamp bead 10 provided by this application.

[0018] Figure 2 It is one of the schematic structural diagrams of the circuit control system provided by this application.

[0019] Figure 3 It is another schematic structural diagram of the circuit control system provided by this application.

[0020] Figure 4 It is yet another schematic structural diagram of the circuit control system provided by this application.

[0021] Figure 5 It is a schematic structural diagram of the constant-current drive circuit provided by this application.

[0022] Figure 6 It is one of the schematic structural diagrams of the line transistor drive circuit provided by this application.

[0023] Figure 7 It is another schematic structural diagram of the line transistor drive circuit provided by this application.

[0024] Reference Signs:

[0025] 1: First electrical pin pad; 2: Second electrical pin pad; 3: Third electrical pin pad; 4: Fourth electrical pin pad; 5: Fifth electrical pin pad; 6: Sixth electrical pin pad; 7: Seventh electrical pin pad; 8: Eighth electrical pin pad; 9: Ninth electrical pin pad; 10: LED lamp bead; 11: LED unit; 12: Triode; 13: Third resistor; 14: Second resistor; 15: First resistor; 16: Input pin of the LED display constant current IC; 17: Output pin of the LED display constant current IC; 18: LED display constant current IC; 19: Fourth resistor; 20: First decoupling capacitor; 21: Second decoupling capacitor; 22: Output pin of the LED display line transistor IC; 23: Input pin of the LED display line transistor IC; 24: LED display line transistor IC. Detailed implementation manner

[0026] To make the objectives, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings in this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts shall fall within the scope of protection of this application.

[0027] It should be noted that in the description of the embodiments of the present invention, the terms "include", "comprise" or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or further elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation of the present invention. Unless otherwise clearly defined and limited, the terms "mount", "connect" and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The terms "first", "second", etc. in the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0029] Due to the technical bottlenecks of the packaging factory, limited by the packaging volume and stability, the currently more mature smallest outdoor Light-Emitting Diode (LED) lamp beads are Surface-Mount Device (SMD) 1415 packages, and only products with a pitch of more than 2.0 mm can be achieved. For conventional MIP lamp beads, due to the lack of market research, there is only one group of light-emitting diodes inside the Micro LED Integrated Package (MIP) lamp beads, such as Mini LED or Micro LED RGB chips. Limited by the luminous intensity of a single chip, the brightness of the LED display screen is at most no more than 2500 Nits, and it can only be applied to indoor scenarios. For the Chip On Board (COB) process of conventional LED display screens, a group of Mini LED or Micro LED RGB chips are used as a pixel point of the LED display screen. Limited by the luminous intensity of a single chip, the brightness of the LED display screen is at most no more than 2500 Nits, and it can only be applied to indoor scenarios.

[0030] The brightness and pitch of the existing LED lamp beads 10 cannot fully meet the market demand.

[0031] The following will be combined with Figures 1 - 4 to describe the LED lamp beads 10 and the circuit control system of the present application.

[0032] Figure 1 is a schematic structural diagram of the LED lamp beads 10 provided by the present application. As Figure 1 shown, an LED lamp bead 10 includes: a plurality of parallel-connected LED units 11. The LED unit 11 includes at least two serially-connected light-emitting diodes of the same color. The plurality of parallel-connected LED units 11 are fixed on a circuit board, and electrical pin pads are provided at the connection points of the positive and negative electrodes of at least two adjacent light-emitting diodes in the middle of the LED unit 11.

[0033] It can be understood that the plurality of parallel-connected LED units 11 include at least two colors of LED units 11.

[0034] It is understandable that in the LED unit 11, an electrical pin pad is provided at the positive electrode of the light-emitting diode arranged at the starting position, and an electrical pin pad is provided at the negative electrode of the light-emitting diode arranged at the end position.

[0035] As Figure 1 shown, the LED lamp bead 10 of the present application includes a plurality of parallel-connected LED units 11. The LED unit 11 includes at least two serially-connected light-emitting diodes (LEDs) of the same color. The plurality of parallel-connected LED units 11 are fixed on a circuit board. For example, the LED lamp bead 10 includes 3 parallel-connected red LED units 11, blue LED units 11, and green LED units 11. The red LED unit 11 includes two red light-emitting diodes (for example, LED_R1 and LED_R2), the blue LED unit 11 includes two blue light-emitting diodes (for example, LED_B1 and LED_B2), and the green LED unit 11 includes two green light-emitting diodes (for example, LED_G1 and LED_G2). The positive electrodes of the plurality of LED units 11 are located at the same end, and the negative electrodes are located at the same end. Inside one LED unit 11, the positive electrode of one light-emitting diode is connected to the negative electrode of the adjacent light-emitting diode.

[0036] Optionally, the color of the LED unit also includes various colors such as yellow and white.

[0037] The single LED lamp bead 10 is integrally encapsulated using epoxy resin, or multiple LED lamp beads 10 are integrally encapsulated. When the single LED lamp bead 10 is encapsulated, in the LED unit 11, an electrical pin pad is provided at the positive electrode of the light-emitting diode arranged at the starting position, an electrical pin pad is provided at the negative electrode of the light-emitting diode arranged at the end position, and an electrical pin pad is provided at the connection between the positive and negative electrodes of two adjacent light-emitting diodes in the middle. For example, as Figure 2 shown, the LED lamp bead 10 includes 3 parallel-connected red LED units 11, blue LED units 11, and green LED units 11. In the blue LED unit 11, a first electrical pin pad 1 is provided at the negative electrode of the blue light-emitting diode arranged at the end position. By analogy, a second electrical pin pad 2 and a third electrical pin pad 3 are provided. In the blue LED unit 11, a fourth electrical pin pad 4 is provided at the negative electrode of the blue light-emitting diode arranged at the starting position. By analogy, a fifth electrical pin pad 5 and a sixth electrical pin pad 6 are provided. In the blue LED unit 11, a seventh electrical pin pad 7 is provided at the connection between the positive and negative electrodes of two adjacent light-emitting diodes in the middle. By analogy, an eighth electrical pin pad 8 and a ninth electrical pin pad 9 are provided. The electrical pin pads are used to connect the control circuit of the LED lamp bead 10 (for example, the first control circuit, the second control circuit, connecting the ground pin, etc.) to control the turning on and off of the light-emitting diodes.

[0038] An electrical pin pad (e.g., the seventh electrical pin pad 7, the eighth electrical pin pad 8, and the ninth electrical pin pad 9) is provided at the connection of the anodes and cathodes of at least two adjacent light-emitting diodes in the middle of the LED unit. The electrical pin pad is connected to a control circuit (e.g., the second control circuit), and can control the turning on and off of some of the light-emitting diodes in the LED unit, so that the LED unit presents different brightness levels.

[0039] At least two light-emitting diodes of the same color are connected in series to obtain an LED unit 11. In an LED unit 11, the brightness of the LED unit 11 can be adjusted by controlling the number of turned-on light-emitting diodes. For example, when a red LED unit 11 needs to reach a high brightness level, two red light-emitting diodes are turned on; when the LED unit 11 needs to reach a low brightness level, one red light-emitting diode is turned on.

[0040] The LED lamp bead 10 provided by the embodiment of the present application includes: a plurality of parallel-connected LED units 11. Each LED unit 11 includes at least two series-connected micro light-emitting diodes LED of the same color. The plurality of parallel-connected LED units 11 are fixed on a circuit board. An electrical pin pad is provided at the connection of the anodes and cathodes of at least two adjacent light-emitting diodes in the middle of the LED unit. By connecting at least two light-emitting diodes of the same color in series to obtain an LED unit 11, the LED unit 11 can present different degrees of brightness, enabling the LED lamp bead 10 to be applied to various brightness scenarios. Connecting LED units 11 of different colors in parallel to obtain an LED lamp bead 10 enriches the colors of the LED lamp bead 10, enabling the LED lamp bead 10 to present various colors.

[0041] The present application provides a circuit control system, including at least one of the above-mentioned LED lamp beads 10, a first control circuit, a second control circuit, and a power supply switching circuit. The first control circuit is connected to a plurality of LED units 11 and the power supply switching circuit. The second control circuit is connected to a plurality of light-emitting diodes and the power supply switching circuit. At least one light-emitting diode in each LED unit 11 is connected to the second control circuit.

[0042] It can be understood that the power supply switching circuit includes a first power supply unit and a second power supply unit. The first power supply unit is connected to the first control circuit, and the second power supply unit is connected to the second control circuit.

[0043] Such as Figure 2As shown, the power supply switching circuit includes a first power supply unit (e.g., VCC) and a second power supply unit (e.g., VDD). The first control circuit is connected to a plurality of parallel LED units 11 and the first power supply unit, and is used to control the disconnection or connection of the plurality of parallel LED units 11 and the first power supply unit. When the LED unit 11 is connected to the first power supply unit, all the light-emitting diodes of the LED unit 11 are in the on state. When the LED unit 11 is disconnected from the first power supply unit, all the light-emitting diodes of the LED unit 11 are in the off state. The second control circuit is connected to a plurality of light-emitting diodes of different colors and the second power supply unit, and is used to control the disconnection or connection of the plurality of light-emitting diodes of different colors and the second power supply unit. When the light-emitting diodes in the second control circuit are connected to the second power supply unit, the light-emitting diodes connected to the second power supply unit are in the on state, and the light-emitting diodes not connected to the second circuit power supply are in the off state.

[0044] By controlling the overall on or off of the LED unit 11 through the first control circuit, the high-brightness state of each LED unit 11 can be regulated. By connecting some of the light-emitting diodes in each LED unit 11 through the second control circuit, the low-brightness state of each light-emitting diode can be achieved. By regulating the brightness through the first control circuit and the second control circuit, the brightness requirements of the LED lamp beads 10 for different application scenarios such as indoor, outdoor, day and night can be met.

[0045] It can be understood that the first control circuit includes a first row transistor driving circuit, the second control circuit includes a second row transistor driving circuit, and the circuit control system of the LED lamp beads 10 further includes a plurality of constant current driving circuits, and each constant current driving circuit is connected to an LED unit 11 of the same color and a ground pin.

[0046] The row transistor driving circuit is commonly used for row scanning control in an LED display screen. The constant current driving circuit is used to provide a stable current to the load (e.g., the LED unit 11 or the light-emitting diode).

[0047] The circuit control system of the LED lamp bead 10 includes a common-anode driving scheme. In the common-anode driving scheme, the first control circuit is the first row transistor driving circuit, and the second control circuit is the second row transistor driving circuit. The first row transistor driving circuit is connected to the power supply switching circuit and the anodes of multiple LED units 11. The second row transistor driving circuit is connected to the power supply switching circuit and the anodes of multiple light-emitting diodes. The multiple constant-current driving circuits include a blue constant-current driving circuit, a green constant-current driving circuit, and a red constant-current driving circuit. The blue constant-current driving circuit is used to connect the negative electrode of the blue LED unit 11 or the blue light-emitting diode and the ground pin. The red constant-current driving circuit is used to connect the negative electrode of the red LED unit 11 or the red light-emitting diode and the ground pin. The green constant-current driving circuit is used to connect the negative electrode of the green LED unit 11 or the green light-emitting diode and the ground pin. As Figure 5 shown, the constant-current driving circuit includes an LED display constant-current IC 18, a first decoupling capacitor 20, a fourth resistor 19, an input pin 16 of the LED display constant-current IC, an output pin 17 of the LED display constant-current IC, etc.

[0048] As Figure 6 shown, the row transistor driving circuit includes an LED display row transistor IC 24, a second decoupling capacitor 21, an input pin 23 of the LED display row transistor IC, an output pin 22 of the LED display row transistor IC, etc.

[0049] Or, as Figure 7 shown, the row transistor driving circuit includes an LED display row transistor IC 24, an input pin 23 of the LED display row transistor IC, an output pin 22 of the LED display row transistor IC, etc.

[0050] Optionally, the first control circuit includes a first constant-current driving circuit group, the second control circuit includes a second constant-current driving circuit group, the circuit control system of the LED lamp bead 10 further includes a row transistor driving circuit, the first constant-current driving circuit group or the second constant-current driving circuit group includes multiple constant-current driving circuits, and each constant-current driving circuit is connected to the LED units 11 of the same color and the power supply switching circuit.

[0051] The circuit control system of the LED lamp bead 10 includes a common cathode driving scheme. In the common cathode driving scheme, the first control circuit is the first constant current driving circuit group, and the second control circuit is the second constant current driving circuit group. The first constant current driving circuit group is connected to the power supply switching circuit and the anodes of multiple LED units 11. The second constant current driving circuit group is connected to the power supply switching circuit and the anodes of multiple light emitting diodes. The first constant current driving circuit group or the second constant current driving circuit group includes a blue constant current driving circuit, a green constant current driving circuit, and a red constant current driving circuit. The blue constant current driving circuit is used to connect the anode of the blue LED unit 11 or the blue light emitting diode and the power supply switching circuit. The red constant current driving circuit is used to connect the anode of the red LED unit 11 or the red light emitting diode and the power supply switching circuit. The green constant current driving circuit is used to connect the anode of the green LED unit 11 or the green light emitting diode and the power supply switching circuit.

[0052] It can be understood that the power supply switching circuit further includes a pulse width modulation (PWM) unit, a first field effect transistor, a second field effect transistor, and a triode. The first field effect transistor is connected to the first power supply unit and the first control circuit. The second field effect transistor is connected to the second power supply unit and the second control circuit. The triode is connected to the PWM unit, the first power supply unit, and the ground pin. The PWM unit is connected to the second power supply unit.

[0053] It can be understood that a light sensor is further included, and the light sensor is connected to the PWM unit.

[0054] It can be understood that a first resistor 15, a second resistor 14, and a third resistor 13 are further included. The first resistor 15 is connected to the triode and the first power supply unit. The second resistor 14 is connected to the PWM unit and the second power supply unit. The third resistor 13 is connected to the PWM unit and the triode 12.

[0055] The first field effect transistor is connected to the first power supply unit and the first control circuit, and is used to control the disconnection and connection of the first power supply unit and the first control circuit. The second field effect transistor is connected to the second power supply unit and the second control circuit, and is used to control the disconnection and connection of the second power supply unit and the second control circuit. The triode is connected to the PWM unit, the first power supply unit, and the ground pin, and is used to control the disconnection and connection of the PWM unit and the first power supply unit.

[0056] The light sensor can sense the change of the external light and issue a level change instruction, or issue a level change instruction through a set algorithm. The light sensor is connected to the pulse width modulation (PWM) unit and is used to issue a level instruction to the PWM unit. For example, a high level instruction is issued in the case of strong light, and a low level instruction is issued in the case of weak light.

[0057] When an LED display screen composed of multiple LED lamp beads 10 is applied to an outdoor daytime scene, the light sensor senses strong light, and the PWM unit issues a high-level instruction. At this time, the triode and the first field-effect transistor are in the conducting state, and the second field-effect transistor is in the cut-off state. The first power supply unit supplies power to the LED unit 11 in the LED lamp bead 10 through the first control circuit (in the common-anode drive scheme, the first control circuit is the first row tube drive circuit, and in the common-cathode drive scheme, the first control circuit is the first constant-current drive circuit group), so that all the light-emitting diodes in the LED unit 11 can be normally lit and work, doubling the brightness of the LED display screen, and the maximum brightness can reach 5500 Nits, thus meeting the display brightness requirements of the outdoor LED display screen during the day.

[0058] When the LED display screen is applied to an outdoor night scene or an indoor scene, excessive display brightness will cause light pollution and damage the eyes of viewers. At this time, the light sensor senses weak light, and the PWM unit issues a low-level instruction. At this time, the triode and the first field-effect transistor are in the cut-off state, and the second field-effect transistor is in the conducting state. The second power supply unit supplies power to some of the light-emitting diodes in the LED lamp bead 10 through the second control circuit (in the common-anode drive scheme, the second control circuit is the second row tube drive circuit, and in the common-cathode drive scheme, the second control circuit is the second constant-current drive circuit group). For example, each LED unit 11 includes two light-emitting diodes of the same color, so that only one light-emitting diode in each LED unit 11 can be normally lit, and the other light-emitting diode is in the off state, reducing the display brightness of each LED unit 11, thereby reducing the overall brightness of the LED display screen. For example, the brightness is reduced to below 2500 Nits, thus meeting the display brightness requirements of the outdoor LED display screen at night. It not only reduces the power consumption of the screen body, but also ensures that the gray level is not lost during low-brightness display, ensuring the true restoration of the picture quality and color.

[0059] The circuit control system provided by the embodiment of the present application includes the above-mentioned LED lamp bead 10, the first control circuit, the second control circuit, and the power supply switching circuit. The first control circuit is connected to multiple LED units 11 and the power supply switching circuit, and the second control circuit is connected to multiple light-emitting diodes and the power supply switching circuit. At least one light-emitting diode in each LED unit 11 is connected to the second control circuit. By connecting the parallel LED units 11 through the first control circuit, it is ensured that all the light-emitting diodes are lit simultaneously, meeting the high-brightness requirements of the LED lamp bead 10. By connecting some of the light-emitting diodes through the second control circuit, it is ensured that only some of the light-emitting diodes are lit simultaneously, meeting the low-brightness requirements of the LED lamp bead 10. The present application realizes different brightness display requirements of the LED lamp bead 10 through different control circuits, enabling the LED lamp bead 10 to be applicable to different brightness scenarios.

[0060] The LED lamp bead and its circuit control system provided by the embodiments of the present application can not only fill the market gap of outdoor LED display products with a pitch of less than 2.0 mm, but also switch the brightness through the first control circuit and the second control circuit, and can simultaneously meet the brightness requirements of different application scenarios such as outdoor, indoor, daytime, and night.

[0061] The embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

[0062] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED lamp bead, characterized in that: include: A plurality of parallel LED units, each of which comprises at least two light-emitting diodes of the same color connected in series, is fixed on a circuit substrate, and an electrical pin pad is provided at the connection point between the positive and negative electrodes of at least two adjacent light-emitting diodes in the middle of the LED unit.

2. The LED lamp bead according to claim 1, characterized in that: The plurality of parallel-connected LED units include LED units of at least two colors.

3. The LED lamp bead according to claim 2, characterized in that: In the LED unit, the electrical pin pad is provided at the positive electrode of the light emitting diode arranged at the starting position, and the electrical pin pad is provided at the negative electrode of the light emitting diode arranged at the end position.

4. A circuit control system, characterized in that: It comprises at least one LED lamp bead as described in any one of claims 1 to 3, a first control circuit, a second control circuit and a power supply switching circuit, wherein the first control circuit connects a plurality of the LED units and the power supply switching circuit, the second control circuit connects a plurality of the light-emitting diodes and the power supply switching circuit, and at least one light-emitting diode in each of the LED units is connected to the second control circuit.

5. The circuit control system according to claim 4, characterized in that: The first control circuit includes a first row tube driving circuit, the second control circuit includes a second row tube driving circuit, and the circuit control system of the LED lamp bead also includes multiple constant current driving circuits, each of which is connected to an LED unit of the same color and a ground pin.

6. The circuit control system according to claim 4, characterized in that: The first control circuit includes a first constant current drive circuit group, the second control circuit includes a second constant current drive circuit group, the circuit control system of the LED lamp bead also includes a row tube drive circuit, the first constant current drive circuit group or the second constant current drive circuit group includes multiple constant current drive circuits, and each of the constant current drive circuits is connected to an LED unit of the same color and the power supply switching circuit.

7. The circuit control system according to any one of claims 4 to 6, characterized in that: The power supply switching circuit includes a first power supply unit and a second power supply unit, the first power supply unit is connected to the first control circuit, and the second power supply unit is connected to the second control circuit.

8. The circuit control system according to claim 7, characterized in that: The power supply switching circuit also includes a pulse width modulation PWM unit, a first field effect transistor, a second field effect transistor and a triode, the first field effect transistor is connected to the first power supply unit and the first control circuit, the second field effect transistor is connected to the second power supply unit and the second control circuit, the triode is connected to the PWM unit, the first power supply unit and a ground pin, and the PWM unit is connected to the second power supply unit.

9. The circuit control system according to claim 8, characterized in that: It also includes a light sensor, which is connected to the PWM unit.

10. The circuit control system according to claim 8 or 9, characterized in that: It also includes a first resistor, a second resistor and a third resistor, the first resistor connects the transistor and the first power supply unit, the second resistor connects the PWM unit and the second power supply unit, and the third resistor connects the PWM unit and the transistor.

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