Time division multiplexing driving circuit, driving system and driving method for light source of surface-type LED (Light Emitting Diode) car lamp

Abstract

The invention discloses a face type LED car lamp light source time division multiplexing driving circuit, driving system and driving method.The driving circuit comprises a pulse power source generating circuit and an LED driving circuit, the pulse power source generating circuit comprises a plurality of pulse power source signal output ends, and the pulse power source signal output ends are connected with the LED driving circuit; at most one pulse power supply signal output end outputs pulse power supply signals at the same time, and each pulse power supply signal output end is connected with the positive electrodes of the multiple sets of LED lamps in a one-to-one correspondence mode. The negative electrode of each LED lamp in each group of LED lamps is connected with the negative electrode of one LED lamp in each other group of LED lamps in a one-to-one correspondence manner and then is grounded through different LED driving circuits; and the LED driving circuits are used for controlling whether the negative electrodes of the LED lamps connected with the LED driving circuits are grounded or not. According to the surface type LED vehicle lamp light source time division multiplexing driving circuit, driving system and driving method, the use of driving chips can be reduced through time division multiplexing, and the driving circuit, driving system and driving method are energy-saving, efficient, low in cost and high in display contrast ratio.

Description

Technical Field

[0001] The present invention relates to the field of circuits, and in particular provides a time-division multiplexing driving circuit, a driving system and a driving method for a planar LED vehicle lamp light source. Background Art

[0002] At present, LED driver chips for automotive lighting are basically constant current drivers. With the popularization of automobiles, car lights, as an important part of human-computer interaction, have become more and more functional and effective. Today's car lights pursue rich display effects and beautiful shapes, and most of them are left-right through-type. The amount of LEDs used is very large, and the number can reach thousands of LEDs to form a surface light source display effect. In the above application scenarios, the space left for electronic components in the car lights will be very small, and the heat generated is high. Traditional stacked LED driver chips (such as Figure 4 The number of methods / control logic / chip cost / power dissipation are relatively large.

[0003] Therefore, it is an urgent problem to propose a new type of planar LED car light source driving circuit to reduce the use of driving chips, reduce energy consumption, save power, and improve the color contrast of car light display. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a time-division multiplexing driving circuit, a driving system and a driving method for a planar LED car light source, so as to solve the problems existing in the conventional stacked LED driving chips.

[0005] On the one hand, the present invention provides a time-sharing multiplexing driving circuit for a surface LED car light source, comprising: a pulse power generating circuit and an LED driving circuit, wherein the pulse power generating circuit comprises a plurality of pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive poles of a plurality of groups of LED lamps, and the negative pole of each LED lamp in each group of LED lamps is respectively connected one-to-one with the negative pole of one LED lamp in each of the other groups of LED lamps, and then respectively grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative pole of the LED lamp connected thereto is grounded.

[0006] Preferably, the LED driving circuit is connected to a core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected thereto is grounded, otherwise, the negative pole of the LED lamp connected thereto is not grounded.

[0007] Further preferably, within each pulse width of the pulse power supply, the core MCU sends a 0 / 1 signal to the LED driving circuit multiple times. When the LED driving circuit receives "0", the LED driving circuit is in a working state, and the corresponding LED lamp is lit. When the LED driving circuit receives "1", the LED driving circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0008] The present invention also provides a time-sharing multiplexing driving system for a surface LED car light source, comprising: a time-sharing multiplexing driving circuit for a surface LED car light source and multiple groups of LED lamps, wherein the time-sharing multiplexing driving circuit for a surface LED car light source comprises a pulse power generating circuit and an LED driving circuit, the pulse power generating circuit comprises multiple pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive electrode of each group of LED lamps, the negative electrode of each LED lamp in each group of LED lamps is respectively connected one-to-one with the negative electrode of one LED lamp in each of the other groups of LED lamps, and then respectively grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative electrode of the LED lamp connected thereto is grounded.

[0009] Preferably, the LED driving circuit is connected to a core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected thereto is grounded, otherwise, the negative pole of the LED lamp connected thereto is not grounded.

[0010] Further preferably, within each pulse width of the pulse power supply, the core MCU sends a 0 / 1 signal to the LED driving circuit multiple times. When the LED driving circuit receives "0", the LED driving circuit is in a working state, and the corresponding LED lamp is lit. When the LED driving circuit receives "1", the LED driving circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0011] The present invention further provides a time-division multiplexing driving method for a planar LED car light source, based on the above-mentioned time-division multiplexing driving system for a planar LED car light source, comprising:

[0012] Adjust the pulse power signal output by the pulse power generation circuit connected to the LED lamp and the working state of the LED driving circuit to realize the control of lighting / closing the LED lamp;

[0013] Adjust the lighting time of the LED light to achieve grayscale control of the LED light.

[0014] Preferably, the control method of turning the LED light on / off is as follows:

[0015] Within each pulse width of the pulse power supply, a 0 / 1 signal is sent to the LED driving circuit through the core MCU multiple times. When the LED driving circuit receives "0", the LED driving circuit is in a working state, and the corresponding LED lamp is lit. When the LED driving circuit receives "1", the LED driving circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0016] Further preferably, the grayscale control method of the LED lamp within the current pulse width is as follows:

[0017] Convert the grayscale value required by the LED lamp within the current pulse width into a binary number, wherein the number of bits of the binary number is N, and N is the preset number of cycles required to light up the LED lamp;

[0018] Scan from the high bit to the low bit of the binary number in sequence, and control the LED light to turn on or off and the number of time slots for turning on or off according to the value of each bit. When the scanned value is 1, the LED light is turned on, and when the value is 0, the LED light is turned off. The number of time slots for turning on or off is 2. n Where n means the current scan is the nth bit of the binary number, and n is an integer between 0 and N-1.

[0019] The surface LED car light source time-sharing multiplexing driving circuit, driving system and driving method provided by the present invention can control the surface light source of the car light by means of pulse time-sharing multiplexing by area and function. A small amount of driving chip is used, a large number of LEDs are carried, and the system has low energy consumption and low power. By adjusting the LED lighting time, the LED display color performance can be better, a higher contrast can be achieved, and the car light effect can be clearer and sharper. The control logic is simpler and more intuitive, thereby saving the car light drive control cost without affecting the effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 A circuit diagram of a time-division multiplexing driving circuit for a planar LED vehicle light source provided by the present invention;

[0022] Figure 2 The circuit diagram of the pulse power generation circuit is shown in FIG.

[0023] Figure 3 It is the mapping relationship diagram between gray value and binary;

[0024] Figure 4 This is the circuit diagram of the traditional flat LED car light source driving circuit. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific implementation schemes, but the present invention is not limited thereto.

[0026] To solve the problems existing in the traditional LED car light source driving circuit, such as Figures 1 to 3 As shown, the present invention provides a time-sharing multiplexing driving circuit for a surface LED car light source, comprising a pulse power generating circuit and an LED driving circuit, wherein the pulse power generating circuit comprises a plurality of pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive poles of a plurality of groups of LED lamps, and the negative pole of each LED lamp in each group of LED lamps is respectively connected one-to-one with the negative pole of one LED lamp in each of the other groups of LED lamps, and then respectively grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative pole of the LED lamp connected thereto is grounded.

[0027] The surface LED car light source time-sharing multiplexing driving circuit can output multiple stable pulse power signals through the power pulse generating circuit, thereby realizing time-sharing multiplexing control of the LED lamp. Multiple LED lamps share one LED driving circuit, which reduces the number of LED driving circuits, reduces energy consumption, and saves the cost of car lamp driving control. The pulse power signal cooperates with the working state of the LED driving circuit to control the conduction time of the LED lamp, thereby realizing multi-level control of the grayscale of the LED lamp and achieving a higher contrast display effect.

[0028] As an improvement of the technical solution, the LED driving circuit is connected to the core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected to it is grounded, otherwise, the negative pole of the LED lamp connected to it is not grounded.

[0029] As an improvement of the technical solution, within each pulse width of the pulse power supply, the core MCU sends a 0 / 1 signal to the LED drive circuit multiple times. When the LED drive circuit receives "0", the LED drive circuit is in a working state, and the corresponding LED lamp is lit. When the LED drive circuit receives "1", the LED drive circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0030] During the process of LED lighting, the lighting time and the brightness perceived by the human eye are in direct proportion. Therefore, the brightness (grayscale) of the LED can be adjusted by adjusting the lighting time of the LED. As an improvement to the technical solution, the grayscale adjustment method of the LED within the current pulse width is as follows:

[0031] Convert the grayscale value required by the LED lamp within the current pulse width into a binary number, wherein the number of bits of the binary number is N, and N is the preset number of cycles required to light up the LED lamp;

[0032] Scan from the high bit to the low bit of the binary number in sequence, and control the LED light to turn on or off and the number of time slots for turning on or off according to the value of each bit. When the scanned value is 1, the LED light is turned on, and when the value is 0, the LED light is turned off. The number of time slots for turning on or off is 2. n Where n means the current scan is the nth bit of the binary number, and n is an integer between 0 and N-1.

[0033] Among them, the total number of LED light on (lighting) time slots in the current pulse width * the time slot unit generated by the timer = the LED light on time in the current pulse width (ie: the total light-emitting time), and the corresponding adjustable gray level is 2 N class.

[0034] In summary, the multi-bit 0 / 1 signal output by the core MCU can control the working state of the LED driving circuit and thus control the off / on of the LED lamp, and can also use the N-cycle mode to adjust the brightness (grayscale) of the LED lamp.

[0035] The present invention also provides a time-sharing multiplexing driving system for a surface LED car light source, comprising a time-sharing multiplexing driving circuit for a surface LED car light source and multiple groups of LED lamps, wherein the time-sharing multiplexing driving circuit for a surface LED car light source comprises a pulse power generating circuit and an LED driving circuit, the pulse power generating circuit comprises multiple pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive electrode of each group of LED lamps, the negative electrode of each LED lamp in each group of LED lamps is respectively connected one-to-one with the negative electrode of one LED lamp in each of the other groups of LED lamps, and then respectively grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative electrode of the LED lamp connected thereto is grounded.

[0036] The surface LED car light source time-sharing multiplexing driving system can output multiple stable pulse power signals through the power pulse generating circuit, thereby realizing time-sharing multiplexing control of the LED lamp. Multiple LED lamps share one LED driving circuit, which reduces the number of LED driving circuits, reduces energy consumption, and saves the cost of car lamp driving control. The pulse power signal cooperates with the working state of the LED driving circuit to control the conduction time of the LED lamp, thereby realizing multi-level control of the grayscale of the LED lamp and achieving a higher contrast display effect.

[0037] As an improvement of the technical solution, the LED driving circuit is connected to the core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected to it is grounded, otherwise, the negative pole of the LED lamp connected to it is not grounded.

[0038] As an improvement of the technical solution, within each pulse width of the pulse power supply, the core MCU sends a 0 / 1 signal to the LED drive circuit multiple times. When the LED drive circuit receives "0", the LED drive circuit is in a working state, and the corresponding LED lamp is lit. When the LED drive circuit receives "1", the LED drive circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0039] During the process of LED lighting, the lighting time and the brightness perceived by the human eye are in direct proportion. Therefore, the brightness (grayscale) of the LED can be adjusted by adjusting the lighting time of the LED. As an improvement to the technical solution, the grayscale adjustment method of the LED within the current pulse width is as follows:

[0040] Convert the grayscale value required by the LED lamp within the current pulse width into a binary number, wherein the number of bits of the binary number is N, and N is the preset number of cycles required to light up the LED lamp;

[0041] Scan from the high bit to the low bit of the binary number in sequence, and control the LED light to turn on or off and the number of time slots for turning on or off according to the value of each bit. When the scanned value is 1, the LED light is turned on, and when the value is 0, the LED light is turned off. The number of time slots for turning on or off is 2. n Where n means the current scan is the nth bit of the binary number, and n is an integer between 0 and N-1.

[0042] Among them, the total number of LED light on (lighting) time slots in the current pulse width * the time slot unit generated by the timer = the LED light on time in the current pulse width (ie: the total light-emitting time), and the corresponding adjustable gray level is 2 N class.

[0043] In summary, the multi-bit 0 / 1 signal output by the core MCU can control the working state of the LED driving circuit and thus control the off / on of the LED lamp, and can also use the N-cycle mode to adjust the brightness (grayscale) of the LED lamp.

[0044] The present invention also provides a time-division multiplexing driving method for a planar LED car light source, based on the above-mentioned time-division multiplexing driving system for a planar LED car light source, comprising:

[0045] Adjust the pulse power signal output by the pulse power generation circuit connected to the LED lamp and the working state of the LED driving circuit to realize the control of lighting / closing the LED lamp;

[0046] Adjust the lighting time of the LED light to achieve grayscale control of the LED light.

[0047] The time-sharing multiplexing driving method for the planar LED car light source adopts the above-mentioned time-sharing multiplexing driving system for the planar LED car light source to realize the time-sharing multiplexing control of the LED lamp. Multiple LED lamps share one LED driving circuit, which reduces the number of LED driving circuits, reduces energy consumption, and saves the cost of car light driving control. The pulse power supply signal cooperates with the working state of the LED driving circuit to control the conduction time of the LED lamp, thereby realizing multi-level control of the grayscale of the LED lamp and achieving a higher contrast display effect.

[0048] As an improvement of the technical solution, the control method of turning on / off the LED light is as follows:

[0049] Within each pulse width of the pulse power supply, a 0 / 1 signal is sent to the LED driving circuit through the core MCU multiple times. When the LED driving circuit receives "0", the LED driving circuit is in a working state, and the corresponding LED lamp is lit. When the LED driving circuit receives "1", the LED driving circuit is in a non-working state, and the corresponding LED lamp is not lit.

[0050] During the process of LED lighting, the lighting time and the brightness perceived by the human eye are in direct proportion. Therefore, the brightness (grayscale) of the LED can be adjusted by adjusting the lighting time of the LED. As an improvement of the technical solution, the grayscale control method of the LED within the current pulse width is as follows:

[0051] Convert the grayscale value required by the LED lamp within the current pulse width into a binary number, wherein the number of bits of the binary number is N, and N is the preset number of cycles required to light up the LED lamp;

[0052] Scan from the high bit to the low bit of the binary number in sequence, and control the LED light to turn on or off and the number of time slots for turning on or off according to the value of each bit. When the scanned value is 1, the LED light is turned on, and when the value is 0, the LED light is turned off. The number of time slots for turning on or off is 2. n Where n means the current scan is the nth bit of the binary number, and n is an integer between 0 and N-1.

[0053] Among them, the total number of LED light on (lighting) time slots in the current pulse width * the time slot unit generated by the timer = the LED light on time in the current pulse width (ie: the total light-emitting time), and the corresponding adjustable gray level is 2 Nclass.

[0054] In summary, the multi-bit 0 / 1 signal output by the core MCU can control the working state of the LED driving circuit and thus control the off / on of the LED lamp, and can also use the N-cycle mode to adjust the brightness (grayscale) of the LED lamp.

[0055] The following is an example of implementing 256-level grayscale adjustment using 8-bit scanning:

[0056] The core MCU timer generates a 10us time slot unit, and an LED light (pixel) is lit in an 8-time lighting mode. The first scan corresponds to 128 time slot units, the second scan corresponds to 64 time slot units, the third scan corresponds to 32 time slot units, the fourth scan corresponds to 16 time slot units, the fifth scan corresponds to 8 time slot units, the sixth scan corresponds to 4 time slot units, the seventh scan corresponds to 2 time slot units, and the eighth scan corresponds to 1 time slot unit. If the corresponding bit is 1, it will be turned on for the corresponding time, and if the corresponding bit is 0, it will be turned off for the corresponding time. After 8 cycles, the total time of conduction is the corresponding 8-bit value. For example, if you need to turn on the LED for 1000us, first calculate the corresponding gray value Gray = total turn-on time / time slot unit = 1000 / 10 = 100; the binary corresponding to 100 is (01100100)2, mapped to Figure 3 , that is, bit7=0, bit6=1, bit5=1, bit4=0, bit3=0, bit2=1, bit1=0, bit0=0. The first scan closes 128 time slots, the second scan turns on 64 time slots, the third scan turns on 32 time slots, the fourth scan closes 16 time slots, the fifth scan closes 8 time slots, the sixth scan turns on 4 time slots, the seventh scan closes 2 time slots, and the eighth scan closes 1 time slot. The total turned-on time slots is 64+32+4=100 time slots, each time slot is 10us, and the total is 1000us.

[0057] Taking the time slot of 10us as an example, for 256 gray levels, the pulse width of PULSE Power1 is 2560us. At this time, LED1 to LED5 can be controlled. According to the gray values ​​of LED1, LED2, LED3, LED4, and LED5, the corresponding control signal (ON / OFF SWITCH) is sent to the LED drive circuit 8 times to control LED1 to LED5. Similarly, the pulse width of PULSE Power2 is 2560us. According to the gray values ​​of LED6, LED7, LED8, LED9, and LED10, the corresponding control signal is sent to the LED drive circuit 8 times to control LED6 to LED10. Since PULSE Powe1 and PULSE Powe2 are mutually exclusive, the visual residual of the human eye is used to realize the gray control of 10 LED light sources with 5 constant current sources, so that all LED chips can be controlled with half of the chips. Among them, the pulse power supply is not limited to 2, and it can be more.

[0058] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the application can adopt the form of complete hardware embodiment, complete software embodiment, or the embodiment in combination with software and hardware. Moreover, the application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0059] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0060] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0061] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0062] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A time-division multiplexing driving circuit for a planar LED car light source, characterized in that: include: A pulse power generating circuit and an LED driving circuit, wherein the pulse power generating circuit comprises a plurality of pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive poles of a plurality of groups of LED lamps, the negative pole of each LED lamp in each group of LED lamps is connected one-to-one with the negative pole of one LED lamp in each other group of LED lamps, and then is grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative pole of the LED lamp connected thereto is grounded.

2. The time-division multiplexing driving circuit for the planar LED vehicle light source according to claim 1, characterized in that: The LED driving circuit is connected to the core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected thereto is grounded, otherwise, the negative pole of the LED lamp connected thereto is not grounded.

3. The time-division multiplexing driving circuit for the surface LED car light source according to claim 1, characterized in that: Within each pulse width of the pulse power supply, the core MCU sends 0 / 1 signals to the LED drive circuit multiple times. When the LED drive circuit receives "0", the LED drive circuit is in a working state, and the corresponding LED lamp is lit. When the LED drive circuit receives "1", the LED drive circuit is in a non-working state, and the corresponding LED lamp is not lit.

4. A time-division multiplexing driving system for a planar LED headlight source, characterized in that: include: A time-sharing multiplexing driving circuit for a surface LED car light source and multiple groups of LED lights, wherein the time-sharing multiplexing driving circuit for a surface LED car light source includes a pulse power generating circuit and an LED driving circuit, the pulse power generating circuit includes multiple pulse power signal output terminals, and at most only one pulse power signal output terminal outputs a pulse power signal at the same time, each pulse power signal output terminal is connected one-to-one with the positive pole of each group of LED lights, the negative pole of each LED lamp in each group of LED lights is connected one-to-one with the negative pole of one LED lamp in each of the other groups of LED lights, and then is grounded through different LED driving circuits, and the LED driving circuit is used to control whether the negative pole of the LED lamp connected to it is grounded.

5. The time-division multiplexing driving system for the surface LED vehicle light source according to claim 4, characterized in that: The LED driving circuit is connected to the core MCU, and the core MCU is used to adjust the working state of the LED driving circuit. When the LED driving circuit is working, the negative pole of the LED lamp connected thereto is grounded, otherwise, the negative pole of the LED lamp connected thereto is not grounded.

6. The time-division multiplexing driving system for the surface LED vehicle light source according to claim 4, characterized in that: Within each pulse width of the pulse power supply, the core MCU sends 0 / 1 signals to the LED drive circuit multiple times. When the LED drive circuit receives "0", the LED drive circuit is in a working state, and the corresponding LED lamp is lit. When the LED drive circuit receives "1", the LED drive circuit is in a non-working state, and the corresponding LED lamp is not lit.

7. A time-division multiplexing driving method for a planar LED headlight source, based on the time-division multiplexing driving system for a planar LED headlight source according to any one of claims 4 to 6, comprising: Adjust the pulse power signal output by the pulse power generation circuit connected to the LED lamp and the working state of the LED driving circuit to realize the control of lighting / closing the LED lamp; Adjust the lighting time of the LED light to achieve grayscale control of the LED light.

8. The time-division multiplexing driving method of the planar LED vehicle light source according to claim 7, characterized in that: The control method of turning on / off the LED light is as follows: Within each pulse width of the pulse power supply, the core MCU sends 0 / 1 signals to the LED drive circuit multiple times. When the LED drive circuit receives "0", the LED drive circuit is in a working state, and the corresponding LED lamp is lit. When the LED drive circuit receives "1", the LED drive circuit is in a non-working state, and the corresponding LED lamp is not lit.

9. The time-division multiplexing driving method of the planar LED vehicle light source according to claim 7, characterized in that: The grayscale control method of the LED light within the current pulse width is as follows: Convert the grayscale value required by the LED lamp within the current pulse width into a binary number, wherein the number of bits of the binary number is N, and N is the preset number of cycles required to light up the LED lamp; Scan from the high bit to the low bit of the binary number in sequence, and control the LED light to turn on or off and the number of time slots for turning on or off according to the value of each bit. When the scanned value is 1, the LED light is turned on, and when the value is 0, the LED light is turned off. The number of time slots for turning on or off is 2. n Where n means the current scan is the nth bit of the binary number, and n is an integer between 0 and N-1.

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