Intelligent Adjustment Method, System, Device and Storage Medium for LED Backlight Driving

Abstract

The present invention provides an intelligent adjustment method, system, device and storage medium for LED backlight driving. Among them, the method includes: obtaining the optimized channel currents on other LED sub-string branches except the non-maximum conduction branch; calculating the number of cycles of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch as the number of cycles of the optimized-conduction PWM; adjusting the channel current of each LED sub-string branch to the corresponding optimized channel current, and adjusting the number of cycles of the PWM conducted by each LED sub-string branch to the number of cycles of the optimized-conduction PWM.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit driving, and particularly to an intelligent adjustment method, system, device and storage medium for LED backlight driving. Background Art

[0002] In the application of LED backlight, the most common application method is the common anode multi-path parallel connection method. As Figure 1 shown, an AC-DC or DC-DC power supply provides a common anode voltage VLED. The anodes (positive terminals) of multiple LED sub-strings are coupled to VLED, and the negative terminals of the LED sub-strings are coupled to the channels of the LED driving chip. For example Figure 1 shown, the LED module includes n LED sub-strings. The negative terminals of each LED sub-string are coupled to the channels (CH1, … CHn) of the LED driving chip, and each LED sub-string includes N LED dies connected in series.

[0003] Due to the deviation of the manufacturing process, the forward conduction voltage VF of each LED die is different. When multiple LED dies are connected in series to form a lamp string, the difference in the total forward conduction voltage N*VF of different lamp strings will be greater. The LED driving chip notifies the AC-DC or DC-DC power supply chip to adjust the VLED voltage through the FB signal to meet the needs of the lamp string with the largest total forward conduction voltage.

[0004] For an LED lamp string, an increase in IF will cause an increase in VF. When VLED remains unchanged, VCH will decrease, and thus PCH will also decrease, so the power consumption on the LED driving chip will decrease. The above method can indeed improve power consumption and increase system efficiency. However, in practical applications, it is found that such a design has a relatively large amount of calculation and requires a large amount of circuitry. Therefore, the static power consumption and area of the LED driving chip are relatively large. Summary of the Invention

[0005] The present invention provides an intelligent adjustment method, system, device and storage medium for LED backlight driving, aiming to improve the power consumption of the LED driving chip, reduce the area of the LED driving chip, increase the efficiency of the system, and at the same time solve the problem of large calculation amount of the LED driving chip.

[0006] According to the first aspect of the present invention, there is provided an intelligent adjustment method for LED backlight driving, which is used to intelligently adjust the driving of an LED module, where the LED module includes multiple LED sub-strings, the anode of each LED sub-string is connected to a power supply, the cathode of each LED sub-string is respectively connected to the corresponding channel of an LED driving circuit, and each LED sub-string includes several LED units connected in series; the method includes:

[0007] Obtain the optimized channel current on each LED sub-string branch other than the non-maximum conduction branch;

[0008] Calculate the number of cycles of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch based on the optimized channel current, and use it as the number of cycles of the optimized-conducted PWM;

[0009] Adjust the channel current of each LED sub-string branch to the corresponding optimized channel current, and adjust the number of cycles of the conducted PWM of each LED sub-string branch to the number of cycles of the optimized-conducted PWM.

[0010] Optionally, before obtaining the optimized channel current, it further includes:

[0011] Set the average current, duty cycle, frame synchronization signal, and the total number of PWM cycles included in one frame of the frame synchronization signal on each LED sub-string branch.

[0012] Optionally, the obtaining of the optimized channel current on each LED sub-string branch other than the non-maximum conduction branch is specifically: obtain the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch as the optimized channel current.

[0013] Optionally, the obtaining of the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch includes:

[0014] Increase the current on each LED sub-string branch other than the non-maximum conduction branch until the preset flag signal on the corresponding LED sub-string branch is triggered; wherein, the flag signal is used to indicate being triggered when the current passing through the corresponding LED sub-string branch reaches the maximum value;

[0015] Record the current that triggers the flag signal, and this current is the maximum channel current on the corresponding LED sub-string branch.

[0016] Optionally, the LED driving circuit is provided with a detection channel, and the flag signal is preset in the detection channel.

[0017] Optionally, the formula based on which the number of cycles of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch is calculated according to the optimized channel current is: wherein, Iavg is the average current of the corresponding LED sub-string branch, ICH_peak is the maximum channel current of the corresponding LED sub-string branch, n is the number of cycles of the PWM conducted within one frame, k is the total number of PWM cycles included in one frame; n and k are positive integers, and n ≤ k.

[0018] Optionally, obtaining the optimized channel current on each of the other LED sub-string branches outside the non-maximum conduction branch specifically includes: obtaining the current closest to the maximum channel current on each of the other LED sub-string branches outside the non-maximum conduction branch as the optimized channel current.

[0019] Optionally, obtaining the current closest to the maximum channel current on each of the other LED sub-string branches outside the non-maximum conduction branch as the optimized channel current specifically includes:

[0020] Obtaining the maximum channel current on each of the other LED sub-string branches outside the non-maximum conduction branch;

[0021] For each LED sub-string branch, according to the formula ICH = Iavg * k / n, where n is selected as 1, 2,..., k, a set of alternative values of the channel current ICH is calculated; where ICH is the channel current, Iavg is the average current of the corresponding LED sub-string branch, n is the number of cycles of the turned-on PWM within one frame, and k is the total number of PWM cycles included in one frame; n and k are positive integers, and n ≤ k;

[0022] Selecting the current that is less than but closest to the maximum channel current from the alternative values as the optimized channel current.

[0023] Optionally, the value of n corresponding to the optimized channel current is the number of cycles of the optimized turned-on PWM.

[0024] Optionally, the intelligent adjustment method for LED backlight driving further includes

[0025] Setting the duty cycle of each LED sub-string branch to an adjustable value.

[0026] According to the second aspect of the present invention, there is provided an intelligent adjustment system for LED backlight driving, which is used to implement the intelligent adjustment method for LED backlight driving described in the first aspect of the present invention. The system includes:

[0027] A current measurement module, configured to measure and obtain the optimized channel current on each of the other LED sub-string branches outside the non-maximum conduction branch;

[0028] A calculation module, configured to calculate the number of cycles of the turned-on PWM of each LED sub-string branch within one frame of the frame synchronization signal as the number of cycles of the optimized turned-on PWM according to the optimized channel current; and

[0029] A setting module, configured to set the channel current of each LED sub-string branch to the corresponding optimized channel current, and set the number of cycles of the turned-on PWM of each LED sub-string branch to the number of cycles of the optimized turned-on PWM.

[0030] Optionally, the system further includes: a parameter setting module, configured to set the average current, duty cycle, frame synchronization signal, and the total number of PWM periods included in one frame of the frame synchronization signal on each LED sub-string branch;

[0031] According to a third aspect of the present invention, there is provided an electronic device, including a processor and a memory; the memory stores a program that can be called by the processor; wherein, when the processor executes the program, it implements the intelligent adjustment method for LED backlight driving according to any one of the first aspects of the present invention.

[0032] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, in which program instructions are stored, and when the program instructions are executed by a processor of a computer, the processor executes the intelligent adjustment method for LED backlight driving according to the first aspect of the present invention.

[0033] The intelligent adjustment method, system, device, and storage medium for LED backlight driving provided by the present invention obtain the number of PWM periods conducted in each LED sub-string branch under the optimized channel current by acquiring the optimized channel current, and adjust the channel current of the LED sub-string to the corresponding optimized channel current and adjust the number of periods of the LED sub-string to the number of PWM periods under the optimized channel current, so as to improve the power consumption of the LED driving chip, reduce the area of the LED driving chip, improve the efficiency of the system, and at the same time solve the problem of large calculation amount of the LED driving chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0035] Figure 1 is a schematic diagram of the driving structure of the LED module;

[0036] Figure 2 is a schematic diagram of the circuit structure for obtaining the maximum channel current in an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the overall flow of the intelligent adjustment method for LED backlight driving in an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of the flow of the intelligent adjustment method for LED backlight driving in an embodiment of the present invention;

[0039] Figure 5It is a schematic flowchart of obtaining an optimized channel current in an embodiment of the present invention;

[0040] Figure 6 It is a waveform schematic diagram of an intelligent adjustment method for LED backlight driving in an embodiment of the present invention;

[0041] Figure 7 It is a schematic flowchart of obtaining a maximum channel current in another embodiment of the present invention;

[0042] Figure 8 It is a waveform schematic diagram of an intelligent adjustment method for LED backlight driving in another embodiment of the present invention;

[0043] Figure 9 It is a module schematic diagram of an intelligent adjustment system for LED backlight driving in an embodiment of the present invention;

[0044] Figure 10 It is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0047] Next, the technical solutions of the present invention will be described in detail with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0048] Please refer to Figures 1 to 4, in an embodiment of the present invention, an intelligent adjustment method for LED backlight driving is provided for intelligently adjusting the driving of the LED module 100, where the LED module includes multiple LED sub-string branches 101, the anodes of each LED sub-string are connected to the power supply 102, and the cathodes of each LED sub-string branch 101 are respectively connected to the corresponding channels of the LED driving circuit 104. Each LED sub-string branch 101 includes several serially connected LED units 103; the method includes:

[0049] S2: Obtain the optimized channel current ICH_opt on each of the other LED sub-string branches 101 except the non-maximum conduction branch.

[0050] Specifically, obtain the maximum channel current ICH_peak on each of the other LED sub-string branches 101 except the non-maximum conduction branch as the optimized channel current ICH_opt. The non-maximum conduction branch refers to the branch with the total number of PWM cycles conducted within one frame less than k.

[0051] Please continue to refer to Figure 3 , where obtaining the maximum channel current ICH_peak on each of the other LED sub-string branches 101 except the non-maximum conduction branch includes:

[0052] S21: Increase the current on each of the other LED sub-string branches 101 except the non-maximum conduction branch until the preset flag signal Status on the corresponding LED sub-string branch 101 is triggered.

[0053] Wherein, the flag signal Status is used to indicate being triggered when the current passing through the corresponding LED sub-string branch 101 reaches the maximum value.

[0054] S22: Record the current that triggers the flag signal Status, and this current is the maximum channel current ICH_peak on the corresponding LED sub-string branch.

[0055] The LED driving circuit is provided with a detection channel, and the flag signal Status is preset in the detection channel.

[0056] S3: Calculate the number of PWM cycles conducted within one frame of the frame synchronization signal Vsync for each LED sub-string branch 101 as the optimized number of PWM cycles n for conduction.

[0057] The formula for calculating the number of PWM cycles conducted within one frame of the frame synchronization signal Vsync for each LED sub-string branch 101 based on the optimized channel current ICH_opt is:

[0058]

[0059] Wherein, Iavg is the average current corresponding to the LED sub-string branch 101, ICH_peak is the maximum channel current corresponding to the LED sub-string branch 101, n is the number of cycles of the turned-on PWM within one frame, and k is the total number of PWM cycles included in one frame; n and k are positive integers, and n ≤ k.

[0060] S4: Adjust the channel current of each LED sub-string branch 101 to the corresponding optimized channel current, and adjust the number of cycles of the turned-on PWM of each LED sub-string branch 101 to the optimized number of cycles n of the turned-on PWM.

[0061] Wherein, please continue to refer to Figure 4 , and before step S2, there is also step S1: Set the average current Iavg, duty cycle D, frame synchronization signal Vsync, and the total number of PWM cycles k included in one frame of the frame synchronization signal on each LED sub-string branch 101.

[0062] Wherein the duty cycle D refers to the ratio of the on-time to the total time within a single PWM cycle. For the sake of simplifying the calculation, in this embodiment, the duty cycles of each LED sub-string branch 101 are kept the same, such as Figure 6 in which, the duty cycle of each LED sub-string branch is 99.99%.

[0063] In order to intuitively display the intelligent adjustment method of the LED backlight drive in the above embodiment, Figure 6 the adjustment method in this embodiment is shown in waveforms, such as Figure 6 shown. After setting the average current Iavg, duty cycle D (specifically, for example, 99.99%), frame synchronization signal Vsync, and the total number of PWM cycles k (specifically, for example, 8) included in one frame of the frame synchronization signal for each LED sub-string branch, for LED sub-string 1, if the measured maximum channel current ICH_peak is 100 mA, then from:

[0064]

[0065] the corresponding n value can be obtained. For example, Figure 6 the n value of LED sub-string 1 in is 4; the n value of LED sub-string 2 is 5; then adjust the optimized channel current of LED sub-string 1 to 100 mA and the n value to 4; correspondingly, the total duty cycle of LED sub-string 1 is 4 / 8 * 99.99%; adjust the optimized channel current of LED sub-string 2 to 80 mA and the n value to 5; correspondingly, the total duty cycle of LED sub-string 2 is 5 / 8 * 99.99%. Other sub-strings are processed similarly.

[0066] In another embodiment of the present invention, obtaining the optimized channel current on each of the other LED sub-string branches 101 outside the non-maximum conduction branch specifically includes:

[0067] Obtaining the current closest to the maximum channel current on each of the other LED sub-string branches 101 outside the non-maximum conduction branch as the optimized channel current ICH_opt.

[0068] Among them, please refer to Figure 7 , obtaining the current closest to the maximum channel current on each of the other LED sub-string branches 101 outside the non-maximum conduction branch as the optimized channel current ICH_opt specifically includes:

[0069] S1: Obtaining the maximum channel current ICH_peak on each of the other LED sub-string branches 101 outside the non-maximum conduction branch.

[0070] S2: For each LED sub-string branch 101, according to the formula ICH = Iavg * k / n, where n is selected as 1, 2,..., k, a set of alternative values of the channel current ICH is calculated; where ICH is the channel current, Iavg is the average current of the corresponding LED sub-string branch, n is the number of periods of the turned-on PWM within one frame, and k is the total number of PWM periods included in one frame; n and k are positive integers, and n ≤ k.

[0071] Among them, the value of n corresponding to the optimized channel current is the number of periods of the optimized turned-on PWM.

[0072] S3: Selecting the current that is less than but closest to the maximum channel current ICH_peak from the alternative values as the optimized channel current ICH_opt.

[0073] In a specific embodiment, the average current, duty cycle, frame synchronization signal, and the total number of PWM cycles included in one frame of the frame synchronization signal are known for each LED sub-string branch. Among them, the frame synchronization signal Vsync and the total number of PWM cycles included in one frame of the frame synchronization signal Vsync are 8. First, the maximum channel current ICH_peak is obtained through the flag signal Status in the detection channel set in the LED driving circuit. Each LED sub-string branch 101 calculates a set of alternative values of the channel current ICH according to the formula ICH = Iavg * k / n, where k is selected as 8 and n is a positive integer less than or equal to 8. Then, a current closest to and less than the maximum channel current ICH_peak is selected from this set of alternative values of the current ICH as the optimized channel current ICH_opt. The PWM cycle number corresponding to the optimized channel current ICH_opt here is the PWM cycle number of the optimized conduction. Compared with using the maximum channel current ICH_peak as the optimized channel current, this embodiment takes into account that the number of conduction PWM cycles n in one frame is a discrete value (such as 1, 2, 3... 8). Therefore, the maximum channel current ICH_peak obtained through the flag signal Status may not satisfy the basic constraint conditions:

[0074]

[0075] Therefore, in this embodiment, it is more accurate to use the current closest to and less than the maximum channel current ICH_peak as the optimized channel current ICH_opt. In the foregoing embodiment, the intelligent adjustment method for LED backlight driving is only achieved by changing the number of conduction PWM cycles n in one frame. In other embodiments, the duty cycle of each LED sub-string branch can also be changed simultaneously. For example, as Figure 8 shown, the duty cycle D of LED sub-string 1 can be, for example, 57.14%, and the duty cycle D of LED sub-string 2 can be, for example, 66.67%. After setting the average current Iavg, duty cycle D, frame synchronization signal Vsync, and the total number of PWM cycles k (specifically 8) included in one frame of each LED sub-string branch, for LED sub-string 1, if the measured maximum channel current ICH_peak is 100 mA, then from

[0076]

[0077] the corresponding n value can be obtained. For example Figure 8For the LED sub-string 1 in , the value of n is 7; for the LED sub-string 2, the value of n is 6. Then, adjust the optimized channel current of the LED sub-string 1 to 100 mA and the value of n to 7. Correspondingly, the total duty cycle of the LED sub-string 1 is 7 / 8 × 57.14%. Adjust the optimized channel current of the LED sub-string 2 to 100 mA and the value of n to 6. Correspondingly, the total duty cycle of the LED sub-string 2 is 6 / 8 × 66.67%. Other sub-strings are processed similarly.

[0078] Please refer to Figure 9 , Embodiment of the present invention also provides an intelligent adjustment system 200 for LED backlight driving, which is used to implement the intelligent adjustment method for LED backlight driving described above. The system includes:

[0079] A current measurement module 202, which is used to measure and obtain the optimized channel current on other LED sub-string branches except the non-maximum conduction branch;

[0080] A calculation module 203, which is used to calculate the number of cycles of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch according to the optimized channel current, as the number of cycles of the optimized conducted PWM; and

[0081] A setting module 204, which is used to set the channel current of each LED sub-string branch to the corresponding optimized channel current, and set the number of cycles of the PWM conducted by each LED sub-string branch to the number of cycles of the optimized conducted PWM.

[0082] Certainly, the system further includes a parameter setting module 201, which is used to set the average current, duty cycle, frame synchronization signal, and the total number of PWM cycles included in one frame of the frame synchronization signal on each LED sub-string branch.

[0083] Please refer to Figure 10 , Embodiment of the present invention also provides an electronic device 30, including a processor 31 and a memory 32; the memory 32 stores a program that can be called by the processor 3. Among them, when the processor 32 executes the program, the processor 31 can communicate with the memory 32 through a bus 33 to implement the intelligent adjustment method for LED backlight driving described above.

[0084] Embodiment of the present invention also provides a computer-readable storage medium. The computer-readable storage medium stores program instructions. When the program instructions are executed by the processor of the computer, the processor executes the intelligent adjustment method for LED backlight driving described above.

[0085] The intelligent adjustment method, system, device and storage medium for LED backlight driving provided by the present invention obtain the number of cycles of PWM conducted in each LED sub-string branch under the optimized channel current by acquiring the optimized channel current, and adjust the channel current of the LED sub-string to the corresponding optimized channel current and adjust the number of cycles of the LED sub-string to the number of cycles of PWM under the optimized channel current, so as to improve the power consumption of the LED driving chip, reduce the area of the LED driving chip, improve the efficiency of the system, and at the same time solve the problem of large computational amount of the LED driving chip.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention 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 on some or all of the technical features; 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 invention.

Claims

1. An intelligent adjustment method for LED backlight driving, which is used to intelligently adjust the driving of an LED module. The LED module includes multiple LED sub-strings, the anode of each LED sub-string is connected to a power supply, the cathode of each LED sub-string is respectively connected to the corresponding channel of an LED driving circuit, and each LED sub-string includes several serially connected LED units; characterized in that, The method includes: Obtaining the optimized channel currents on other LED sub-string branches except the non-maximum conduction branch; Calculating the number of periods of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch based on the optimized channel currents, as the number of periods of the optimized-conduction PWM; Adjusting the channel currents of each LED sub-string branch to the corresponding optimized channel currents, and adjusting the number of periods of the PWM conducted by each LED sub-string branch to the number of periods of the optimized-conduction PWM; Wherein, obtaining the current closest to the maximum channel current on other LED sub-string branches except the non-maximum conduction branch as the optimized channel current specifically includes: Obtaining the maximum channel currents on other LED sub-string branches except the non-maximum conduction branch; For each LED sub-string branch, according to the formula ICH = Iavg * k / n, selecting n as 1, 2,..., k, a set of alternative values of the channel current ICH is calculated; where ICH is the channel current, Iavg is the average current of the corresponding LED sub-string branch, n is the number of periods of the PWM conducted within one frame, and k is the total number of PWM periods included in one frame; n and k are positive integers, and n ≤ k; Selecting the current less than but closest to the maximum channel current from the alternative values as the optimized channel current; Wherein, obtaining the maximum channel currents on other LED sub-string branches except the non-maximum conduction branch includes: Increasing the currents on other LED sub-string branches except the non-maximum conduction branch until a preset flag signal on the corresponding LED sub-string branch is triggered; wherein the flag signal is used to indicate being triggered when the current passing through the corresponding LED sub-string branch reaches the maximum value; Recording the current that triggers the flag signal, and this current is the maximum channel current on the corresponding LED sub-string branch; The LED driving circuit is provided with a detection channel, and the flag signal is preset in the detection channel.

2. The intelligent adjustment method for LED backlight driving according to claim 1, characterized in that Before obtaining the optimized channel currents on other LED sub-string branches except the non-maximum conduction branch, it further includes: Setting the average current, duty cycle, frame synchronization signal, and the total number of PWM periods included in one frame of the frame synchronization signal on each LED sub-string branch.

3. The intelligent adjustment method for LED backlight driving according to claim 2, characterized in that The obtaining of the optimized channel currents on other LED sub-string branches except the non-maximum conduction branch is specifically: obtaining the maximum channel currents on other LED sub-string branches except the non-maximum conduction branch as the optimized channel currents.

4. The intelligent adjustment method for LED backlight driving according to claim 2, characterized in that The formula based on which the number of periods of the PWM conducted within one frame of the frame synchronization signal for each LED sub-string branch is calculated according to the optimized channel current is: Wherein, Iavg is the average current of the corresponding LED sub-string branch, ICH_peak is the maximum channel current of the corresponding LED sub-string branch, n is the number of cycles of the turned-on PWM within one frame, and k is the total number of PWM cycles included in one frame; n and k are positive integers, and n ≤ k.

5. The intelligent adjustment method for LED backlight driving according to claim 2, wherein the step of obtaining the optimized channel current on each LED sub-string branch other than the non-maximum conduction branch specifically includes: obtaining the current closest to the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch as the optimized channel current.

6. The intelligent adjustment method for LED backlight driving according to claim 5, wherein the value of n corresponding to the optimized channel current is the number of cycles of the optimized turned-on PWM.

7. The intelligent adjustment method for LED backlight driving according to any one of claims 1 to 6, characterized in that, It further includes setting the duty cycle of each LED sub-string branch to an adjustable value.

8. An intelligent adjustment system for LED backlight driving, which is used to implement the intelligent adjustment method for LED backlight driving according to any one of claims 1 to 7, characterized in that, The system includes: a current measurement module, configured to measure and obtain the optimized channel current on each LED sub-string branch other than the non-maximum conduction branch; Wherein, the step of obtaining the current closest to the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch as the optimized channel current specifically includes: obtaining the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch; for each LED sub-string branch, according to the formula ICH = Iavg * k / n, selecting n as 1, 2,..., k, and calculating a set of alternative values of the channel current ICH; wherein, ICH is the channel current, Iavg is the average current of the corresponding LED sub-string branch, n is the number of cycles of the turned-on PWM within one frame, and k is the total number of PWM cycles included in one frame; n and k are positive integers, and n ≤ k; selecting the current less than but closest to the maximum channel current from the alternative values as the optimized channel current; Wherein, the step of obtaining the maximum channel current on each LED sub-string branch other than the non-maximum conduction branch includes: increasing the current on each LED sub-string branch other than the non-maximum conduction branch until a preset flag signal on the corresponding LED sub-string branch is triggered; wherein, the flag signal is used to indicate being triggered when the current passing through the corresponding LED sub-string branch reaches the maximum value; recording the current at which the flag signal is triggered, and this current is the maximum channel current on the corresponding LED sub-string branch; the LED driving circuit is provided with a detection channel, and the flag signal is preset in the detection channel; a calculation module, configured to calculate, according to the optimized channel current, the number of cycles of the turned-on PWM within one frame of the frame synchronization signal for each LED sub-string branch as the number of cycles of the optimized turned-on PWM; and a setting module, configured to set the channel current of each LED sub-string branch to the corresponding optimized channel current, and set the number of cycles of the turned-on PWM of each LED sub-string branch to the number of cycles of the optimized turned-on PWM.

9. The intelligent adjustment system for LED backlight driving according to claim 8, wherein The system further includes: A parameter setting module is used to set the average current, duty cycle, frame synchronization signal, and the total number of PWM periods included in one frame of the frame synchronization signal on each LED sub-string branch.

10. An electronic device, characterized in that, It includes a processor and a memory; the memory stores a program that can be called by the processor; wherein, when the processor executes the program, it implements the intelligent adjustment method for LED backlight driving according to any one of claims 1 to 7.

11. A computer-readable storage medium, characterized in that, Program instructions are stored in the computer-readable storage medium, and when the program instructions are executed by the processor of the computer, the processor executes the intelligent adjustment method for LED backlight driving according to any one of claims 1 to 7.

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