Backlight data transmission method, micro control unit and local backlight adjustment system

Abstract

A backlight data transmission method is applied to a microcontroller unit. The backlight data transmission method includes: in response to a first vertical synchronization signal of a current picture frame sent by a logic board, receiving complete backlight data sent by a logic board within a first preset time period, wherein the complete backlight data includes backlight data corresponding to each backlight partition, wherein the duration of the first preset time period is greater than the duration of the first vertical synchronization signal being in an effective level state within one cycle (S1); sending the complete backlight data to a backlight driving module within a second preset time period located after the first preset time period, wherein the sum of the duration of the first preset time period and the duration of the second preset time period is less than the cycle of the first vertical synchronization signal (S2). A microcontroller unit and a local backlight adjustment system are also provided.

Description

Technical Field

[0001] The present disclosure relates to the display field, and in particular to a backlight data transmission method, a micro control unit and a local backlight adjustment system. Background Art

[0002] Local Dimming technology refers to partitioning the backlight part and controlling each backlight partition individually; for example, dimming the luminous brightness of the backlight partition corresponding to the low-brightness area in the display screen, or brightening the luminous brightness of the backlight partition corresponding to the high-brightness area in the display screen, thereby effectively improving the contrast of the display screen and improving the quality of the display screen. Summary of the invention

[0003] The present invention provides a backlight data transmission method, a micro control unit and a local backlight adjustment system.

[0004] In a first aspect, an embodiment of the present disclosure provides a backlight data transmission method, wherein the method is applied to a micro control unit, and the method includes:

[0005] In response to a first vertical synchronization signal of a current picture frame sent by the logic board, receiving complete backlight data sent by the logic board within a first preset time period, wherein the complete backlight data includes backlight data corresponding to each backlight partition, wherein the duration of the first preset time period is greater than the duration of the first vertical synchronization signal being in an effective level state within one cycle;

[0006] The complete backlight data is sent to the backlight driving module within a second preset time period after the first preset time period, and the sum of the first preset time period and the second preset time period is less than the period of the first vertical synchronization signal.

[0007] In some embodiments, the logic board and the micro control unit transmit backlight data based on a serial peripheral interface protocol.

[0008] In some embodiments, the duration T1 of the first preset time period satisfies:

[0009]

[0010] n1 is the total number of backlight partitions, A is the number of bits of backlight data corresponding to one backlight partition, B is the number of bits of non-backlight data transmitted during the transmission of complete backlight data between the logic board and the microcontroller unit, f1 is the signal transmission rate between the logic board and the microcontroller unit, f2 is the backlight refresh frequency, α is the first preset margin coefficient and 1≤α≤1.5.

[0011] In some embodiments, the bit number A of the backlight data corresponding to a backlight partition is 16 bits, the bit number B of the non-backlight data transmitted during the transmission of complete backlight data between the logic board and the micro control unit is 32 bits, and the preset margin coefficient α is 1.1.

[0012] In some embodiments, the micro control unit and the driving module transmit backlight data based on a serial peripheral interface protocol.

[0013] In some embodiments, the duration T2 of the second preset time period satisfies:

[0014]

[0015] n2 is the number of backlight partitions corresponding to the communication channel with the most backlight data transmitted between the micro control unit and the driving module, A is the number of bits of backlight data corresponding to a backlight partition, C is the number of bits of non-backlight data transmitted in the process of transmitting complete backlight data between the micro control unit and the backlight driving module, N is the number of driving chips in the backlight driving module, D is the number of bits to identify a driving chip, f3 is the signal transmission rate between the micro control unit and the driving module, f2 is the backlight refresh frequency, β is the second preset margin coefficient and 1≤β≤1.5.

[0016] In some embodiments, the number of bits A of backlight data corresponding to a backlight partition is 16 bits, the number of bits C of non-backlight data transmitted during the transmission of complete backlight data between the logic board and the microcontroller unit is 24 bits, the number of bits D identifying a driver chip is 8 bits, and the second preset margin coefficient β is 1.1.

[0017] In some embodiments, the total number of backlight partitions is 72;

[0018] Two communication channels are arranged between the micro control unit and the driving module, one of which is configured to transmit backlight data corresponding to 40 backlight partitions, and the other is configured to transmit backlight data corresponding to the remaining 32 backlight partitions.

[0019] In some embodiments, when receiving the first vertical synchronization signal sent by the logic board and switching from the non-valid level state to the valid level state, the micro control unit starts to receive the backlight data sent by the logic board.

[0020] In some embodiments, the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

[0021]

[0022] f2 is the backlight refresh frequency.

[0023] In some embodiments, the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

[0024] In some embodiments, before the step of receiving the complete backlight data sent by the logic board within the first preset time period in response to the first vertical synchronization signal sent by the logic board, further included are:

[0025] Collect the second vertical synchronization signals corresponding to several picture frames before the current picture frame, and determine the frequency of the third vertical synchronization signal according to the frequency of the second vertical synchronization signal. One period of the third vertical synchronization signal includes: a first preset time period and a second preset time period;

[0026] The frequency of the third vertical synchronization signal is P times the frequency of the second vertical synchronization signal, where P is a positive integer.

[0027] In some embodiments, P is 8.

[0028] In a second aspect, an embodiment of the present disclosure further provides a microcontroller unit, including: a processor and a storage medium. The storage medium stores a computer program, and when the computer program is executed by the processor, it implements the backlight data transmission method provided in the first aspect.

[0029] In a third aspect, an embodiment of the present disclosure further provides a local backlight adjustment system, which includes: a logic board, a backlight driving module, and the microcontroller unit provided in the second aspect. Description of the Drawings

[0030] Figure 1 It is a structural block diagram of a local backlight adjustment system involved in the present disclosure;

[0031] Figure 2 It is a timing diagram corresponding to the transmission of backlight data from the logic board to the light emitting driving module in the related art;

[0032] Figure 3 It is a flowchart of a backlight data transmission method provided by an embodiment of the present disclosure;

[0033] Figure 4 It is a flowchart of another backlight data transmission method provided by an embodiment of the present disclosure;

[0034] Figure 5 It is a timing diagram corresponding to the transmission of backlight data from the logic board to the light emitting driving module in the present disclosure. Detailed Embodiments

[0035] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, a backlight data transmission method, a micro control unit and a local backlight adjustment system provided by the present disclosure are described in detail below with reference to the accompanying drawings.

[0036] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0037] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0038] It will be understood that although the terms first, second, etc. may be used herein to describe various objects, these objects should not be limited by these terms, and these terms are only used to distinguish one object from another.

[0039] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0040] Figure 1 A structural block diagram of the local backlight adjustment system involved in the present disclosure is shown in FIG. Figure 1 As shown, the local backlight adjustment system includes: a logic board (TCON, also called a control board) 1, a micro control unit (MCU) 2 and a light driving module 3.

[0041] Among them, the local backlight adjustment process is as follows: the external digital board sends the image data to the logic board 1, and the logic board 1 performs calculations based on the pre-set local backlight adjustment algorithm based on the received image data sampling to generate the backlight data of each backlight partition; after obtaining the backlight data of each backlight group, the logic board 1 sends the backlight data of each backlight group to the micro control unit 2; after receiving all the backlight data, the micro control unit 2 sends these data to the light driving module 3, and the light driving module 3 generates a driving signal corresponding to each backlight partition according to the received backlight data of each backlight partition, so as to drive the light-emitting elements (such as LEDs) in each backlight partition to emit light.

[0042] Since the process of the logic board 1 calculating the backlight data of each backlight partition and the process of transmitting the backlight data to the light-emitting driving module 3 takes a certain amount of time, there is a time delay between the logic board 1 receiving the image data and the light-emitting driving module 3 outputting the driving signal according to the backlight data, that is, the total delay of the local backlight adjustment process. Since the time for the logic board 1 to calculate the backlight data of each backlight partition is generally within the time corresponding to one frame of the picture, and the transmission of the backlight data starts from the next frame, the delay is generally greater than the time corresponding to one frame of the picture.

[0043] In order to facilitate those skilled in the art to better understand the technical solution of the present disclosure, the relevant technology is now described. Figure 2 FIG. 1 is a timing diagram corresponding to the transmission of backlight data from the logic board 1 to the light-emitting driving module 3 in the related art, such as Figure 2As shown, in the related art, the micro control unit 2 receives data under the control of the vertical synchronization signal of the picture frame sent by the logic board 1. Specifically, the vertical synchronization signal of the picture frame includes a first part in a valid level state and a second part in a non-valid level state, taking the valid level state as a high level state and the non-valid level state as a low level state as an example. When the vertical synchronization signal of the picture frame is in a high level state, the micro control unit 2 obtains the backlight data of each backlight partition from the logic board 1. Among them, since the pulse width of the vertical synchronization signal of the picture frame is small, the time that the vertical synchronization signal is in a high level state within the time corresponding to one frame of the picture is short (that is, the duration of the first part is short), so in the time period of the high level state within one cycle of the vertical synchronization signal of the picture frame, the micro control unit 2 cannot obtain the backlight data of all backlight partitions (that is, the complete backlight data cannot be obtained). Therefore, the micro control unit 2 often receives part of the backlight data within the time period t0 when the vertical synchronization signal corresponding to one frame of the picture is in a high-level state, and then stores the received part of the backlight data through direct memory access (DMA); after receiving the vertical synchronization signal corresponding to the next picture frame sent by the logic board 1, the micro control unit 2 receives the remaining part of the backlight data within the time period t0 when the vertical synchronization signal corresponding to the next picture frame is in a high-level state, thereby obtaining complete backlight data; finally, the complete data is sent to the light-emitting driving module 3.

[0044] It can be seen that in the related art, the time it takes for the backlight data to be transmitted from the logic board 1 to the light-emitting driving module 3 is also greater than the duration corresponding to one frame of the picture. Since the duration corresponding to the backlight data of each backlight partition calculated by the logic board 1 is the duration corresponding to one frame of the picture, the total delay from the receipt of the image data by the logic board 1 to the output of the driving signal by the light-emitting driving module 3 according to the backlight data in the related art is greater than the duration corresponding to two frames of the picture. The greater the total delay, the greater the risk of the display signal and the backlight signal being out of sync.

[0045] In order to effectively improve the above technical problems, the embodiments of the present disclosure provide corresponding solutions, which will be described in detail below with reference to the accompanying drawings.

[0046] Figure 3 A flowchart of a backlight data transmission method provided by an embodiment of the present disclosure is shown in FIG. Figure 3 As shown, the backlight data transmission method is applied to the micro control unit 2 in the local backlight adjustment system, and the backlight data transmission method includes:

[0047] Step S1, in response to the first vertical synchronization signal of the current picture frame sent by the logic board, receive the complete backlight data sent by the logic board within a first preset time period, the complete backlight data includes the backlight data corresponding to each backlight partition, wherein the duration of the first preset time period is greater than the duration that the first vertical synchronization signal is in an effective level state within one cycle.

[0048] Step S2, sending the complete backlight data to the backlight driving module within a second preset time period located after the first preset time period; wherein the sum of the length of the first preset time period and the length of the second preset time period is less than the period of the first vertical synchronization signal.

[0049] In the embodiment of the present disclosure, the time when the micro control unit 2 receives the backlight data from the logic board 1 is no longer controlled by the time when the vertical synchronization signal (i.e., the first vertical synchronization signal) of the picture frame is in the effective level state, but is based on a pre-set first preset time period, which is greater than the time when the first vertical synchronization signal is in the effective level state and enables the micro control unit 2 to continuously and once obtain the complete backlight data. In addition, within the second preset time period after receiving the complete backlight data, the micro control unit 2 can send the complete backlight data to the backlight driving module 3; since the sum of the length of the first preset time period and the length of the second preset time period is less than the cycle of the first vertical synchronization signal, that is, the total time spent by the logic board 1 to transmit the backlight data to the light driving module 3 is less than the length corresponding to one frame of the picture. Therefore, compared with the related art, the technical solution provided by the present disclosure takes a shorter time to transmit the backlight data from the logic board 1 to the light driving module 3, which is conducive to reducing the total delay in the local backlight adjustment process, thereby reducing the risk of the display signal and the backlight signal being out of sync.

[0050] In some embodiments, the logic board 1 and the microcontroller unit 2 transmit backlight data based on the serial peripheral interface (SPI) protocol. In some embodiments, the microcontroller unit 2 and the driver module 3 transmit backlight data based on the serial peripheral interface protocol. The serial peripheral interface is a high-speed, full-duplex, synchronous communication bus with a signal transmission rate of up to 15 MHz, thus having a high data transmission rate. Taking the case that the backlight data corresponding to a backlight partition is 16 bits, the shortest time required to transmit the backlight data corresponding to a backlight partition using the SPI protocol is

[0051] In some embodiments, the duration T1 of the first preset time period satisfies:

[0052]

[0053] n1 is the total number of backlight partitions, A is the number of bits of backlight data corresponding to one backlight partition, B is the number of bits of non-backlight data (such as device address, register address and other broadcast information) transmitted in the process of transmitting complete backlight data between the logic board 1 and the micro control unit 2, f1 is the signal transmission rate between the logic board 1 and the micro control unit 2, f2 is the backlight refresh frequency, α is the first preset margin coefficient and 1≤α≤1.5.

[0054] In some embodiments, the bit number A of the backlight data corresponding to a backlight partition is 16 bits, the bit number B of the non-backlight data transmitted during the transmission of the complete backlight data between the logic board 1 and the micro control unit 2 is 32 bits, and the preset margin coefficient α is 1.1.

[0055] At this time, the above formula (1) becomes:

[0056]

[0057] In some embodiments, in some embodiments, the duration T2 of the second preset time period satisfies:

[0058]

[0059] n2 is the number of backlight partitions corresponding to the communication channel with the most backlight data transmitted between the micro control unit 2 and the driving module 3, A is the number of bits of backlight data corresponding to a backlight partition, C is the number of bits of non-backlight data transmitted in the process of transmitting complete backlight data between the micro control unit 2 and the backlight driving module 3, N is the number of driving chips in the backlight driving module 3, D is the number of bits to identify a driving chip, f3 is the signal transmission rate between the micro control unit 2 and the driving module 3, f2 is the backlight refresh frequency, β is the second preset margin coefficient and 1≤β≤1.5.

[0060] In some embodiments, the number of bits A of backlight data corresponding to a backlight partition is 16 bits, the number of bits C of non-backlight data transmitted during the transmission of complete backlight data between the logic board 1 and the microcontroller unit 2 is 24 bits, the number of bits D identifying a driver chip is 8 bits, and the second preset margin coefficient β is 1.1.

[0061] At this time, formula (3) becomes:

[0062]

[0063] It should be noted that, since the number of channels of each driver chip is limited, when there are a large number of backlight partitions, multiple driver chips are needed to drive. Therefore, during the transmission of backlight data, it is necessary to identify the driver chips. Where n1 is the total number of backlight partitions, S is the number of channels configured by a driver chip, It means that the quotient of n1 and S is rounded up. Taking the total number of backlight partitions n1=72 and the number of channels configured by the driver chip S=16 as an example, the number of driver chips required to be set N=5.

[0064] In some embodiments, the total number of backlight partitions is 72, and one communication channel is provided between the microcontroller unit 2 and the driver module 3; two communication channels (for example, forming two SPI channels) are provided between the microcontroller unit 2 and the driver module 3, one of which is configured to transmit backlight data corresponding to 40 backlight partitions, and the other is configured to transmit backlight data corresponding to the remaining 32 backlight partitions. In this case, the value of n1 in the above formulas (1) and (2) is 72, and the value of n2 in the formulas (3) and (4) is 40.

[0065] In some embodiments, when receiving the first vertical synchronization signal sent by the logic board 1 and switching from the non-valid level state to the valid level state, the micro control unit 2 starts to receive the backlight data sent by the logic board 1. The above setting enables the micro control unit 2 to synchronously start to obtain the backlight data from the logic board 1 when the previous picture frame ends and the current picture frame begins, which is beneficial to reduce the total delay in the local backlight adjustment process.

[0066] In some embodiments, the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

[0067]

[0068] Among them, f2 is the backlight refresh frequency.

[0069] Through the above settings, the duration for the micro control unit 2 to receive and send complete backlight data can be less than or equal to the backlight refresh cycle, so that the backlight can complete the new brightness refresh in time.

[0070] In some embodiments, the display refresh frequency of the picture frame is 60 Hz, and the backlight refresh frequency is 480 Hz; at this time, the period of the first vertical synchronization signal is approximately 18.8 ms, and the backlight refresh period is approximately 2.08 ms.

[0071] In some embodiments, the duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

[0072] It should be noted that, in the embodiment of the present disclosure, the sizes of T1 and T2 and the ratio thereof can be pre-designed according to actual needs.

[0073] Figure 4A flowchart of another backlight data transmission method provided by an embodiment of the present disclosure, such as Figure 4 As shown, the backlight data transmission method is applied to a micro control unit in a local backlight adjustment system. The backlight data transmission method not only includes the above-mentioned steps S1 and S2, but also includes step S0 before step S1. Only step S0 is described in detail below.

[0074] Step S0, collecting the second vertical synchronization signal corresponding to several picture frames before the current picture frame, and determining the frequency of the third vertical synchronization signal according to the frequency of the second vertical synchronization signal; wherein one cycle of the third vertical synchronization signal includes: a first preset time period and a preset second time period, and the frequency of the third vertical synchronization signal is P times the frequency of the second vertical synchronization signal, and P is a positive integer.

[0075] The third vertical synchronization signal is a signal generated inside the micro control unit 2, and is used to correspond to the first preset time period and the second preset time period. The third vertical synchronization signal corresponds to the first preset time period when it is in an effective level state, and corresponds to the second preset time period when it is in an ineffective level state. The micro control unit 2 can obtain the second vertical synchronization signal by multiplying the frequency. The period of the third vertical synchronization signal is 1 / P of the period of the second vertical synchronization signal.

[0076] Through the above settings, the time taken for the backlight data to be transmitted from the logic board 1 to the light driving module 3 can be limited to T0 / P, where T0 is the period of the vertical synchronization signal corresponding to the picture frame. At this time, the total delay in the local backlight adjustment process is less than or equal to (1+1 / P)*T0.

[0077] In the embodiment of the present disclosure, the frequency of the second vertical synchronization signal corresponding to several frames before the current picture frame is captured, and then the frequency of the third vertical synchronization signal is readjusted to ensure that when the frequency of the vertical synchronization signal of the picture frame emitted by the logic board 1 changes, the frequency of the third vertical synchronization signal changes synchronously.

[0078] In some embodiments, the value of P is 8, that is, the second vertical synchronization signal is processed by 8 times the frequency to obtain the third vertical synchronization signal. At this time, the total delay in the local backlight adjustment process is about 1.125*T0. Taking the display refresh frequency of the picture frame as 60HZ as an example, the total delay in the local backlight adjustment process is about 18.75ms.

[0079] It should be noted that the time that the third vertical synchronization signal is in the effective level state (corresponding to the first preset time period) and in the ineffective level state (corresponding to the second preset time period) in one cycle can be controlled by the timer in the micro control unit 2. After the micro control unit 2 receives the vertical synchronization signal of the picture frame sent by the logic board 1, the count of the timer is cleared to 0 and the count is restarted.

[0080] In actual applications, the microcontroller unit 2 may also send a third vertical synchronization signal to the logic board 1 and the light driving module 3, so that the logic board 1 sends complete backlight data to the microcontroller unit 2 within a first preset time period, and the light driving module 3 receives the complete backlight data sent by the microcontroller unit 2 within a second preset time period.

[0081] Figure 5 FIG. 1 is a timing diagram corresponding to the transmission of backlight data from the logic board to the light-emitting driving module in the present disclosure, such as Figure 5 As shown, taking the effective level state as the high level state and the ineffective level state as the low level state as an example; when the third vertical synchronization signal is in the high level state, it corresponds to the first preset time period, at which time the logic board sends the complete backlight data to the micro control unit; when the third vertical synchronization signal is in the low level state, it corresponds to the second preset time period, at which time the micro control unit sends the complete backlight data to the light-emitting driving module.

[0082] Compared with the related art, the technical solution provided by the present invention takes a shorter time to transmit the backlight data from the logic board to the light driving module, which is beneficial to reducing the total delay in the local backlight adjustment process, thereby reducing the risk of asynchrony between the display signal and the backlight signal.

[0083] Based on the same inventive concept, an embodiment of the present disclosure further provides a micro control unit, which includes: a processor and a storage medium, wherein a computer program is stored in the storage medium, and when the computer program is executed by the processor, the backlight data transmission method provided in the previous embodiment is implemented.

[0084] Continue to see Figure 1 As shown, based on the same inventive concept, the embodiment of the present disclosure also provides a local backlight adjustment system, which includes: a logic board 1, a backlight driving module 3 and a micro control unit 2. For the specific description of the micro control unit 2, please refer to the corresponding content in the previous embodiment, which will not be repeated here.

[0085] It will be appreciated by those skilled in the art that all or some of the steps in the method disclosed above, the functional modules / units in the device may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media generally contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0086] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A backlight data transmission method, in, The method is applied to a micro control unit, and the method comprises: In response to a first vertical synchronization signal of a current picture frame sent by the logic board, receiving complete backlight data sent by the logic board within a first preset time period, wherein the complete backlight data includes backlight data corresponding to each backlight partition, wherein the duration of the first preset time period is greater than the duration of the first vertical synchronization signal being in an effective level state within one cycle; Sending the complete backlight data to the backlight driving module within a second preset time period after the first preset time period, wherein the sum of the first preset time period and the second preset time period is less than the period of the first vertical synchronization signal; The duration T1 of the first preset time period satisfies: n1 is the total number of backlight partitions, A is the number of bits of backlight data corresponding to one backlight partition, B is the number of bits of non-backlight data transmitted during the transmission of complete backlight data between the logic board and the microcontroller unit, f1 is the signal transmission rate between the logic board and the microcontroller unit, f2 is the backlight refresh frequency, α is the first preset margin coefficient and 1≤α≤1.

5.

2. The method according to claim 1, in, The backlight data is transmitted between the logic board and the micro control unit based on a serial peripheral interface protocol.

3. The method according to claim 2, in, The bit number A of the backlight data corresponding to one backlight partition is 16 bits, the bit number B of the non-backlight data transmitted during the transmission of the complete backlight data between the logic board and the micro control unit is 32 bits, and the preset margin coefficient α is 1.

1.

4. The method according to any one of claims 1 to 3, in, The backlight data is transmitted between the micro control unit and the driving module based on a serial peripheral interface protocol.

5. The method according to any one of claims 1 to 3, in, The duration T2 of the second preset time period satisfies: n2 is the number of backlight partitions corresponding to the communication channel with the most backlight data transmitted between the micro control unit and the driving module, A is the number of bits of backlight data corresponding to a backlight partition, C is the number of bits of non-backlight data transmitted in the process of transmitting complete backlight data between the micro control unit and the backlight driving module, N is the number of driving chips in the backlight driving module, D is the number of bits to identify a driving chip, f3 is the signal transmission rate between the micro control unit and the driving module, f2 is the backlight refresh frequency, β is the second preset margin coefficient and 1≤β≤1.

5.

6. The method according to claim 5, in, The number of bits A of backlight data corresponding to a backlight partition is 16 bits, the number of bits C of non-backlight data transmitted during the transmission of complete backlight data between the logic board and the microcontroller unit is 24 bits, the number of bits D identifying a driver chip is 8 bits, and the second preset margin coefficient β is 1.

1.

7. The method according to claim 5, in, The total number of backlight zones is 72; Two communication channels are arranged between the micro control unit and the driving module, one of which is configured to transmit backlight data corresponding to 40 backlight partitions, and the other is configured to transmit backlight data corresponding to the remaining 32 backlight partitions.

8. The method according to claim 1, in, When receiving the first vertical synchronization signal sent by the logic board and switching from the non-effective level state to the effective level state, the micro control unit starts to receive the backlight data sent by the logic board.

9. The method according to claim 1, in, The duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy: f2 is the backlight refresh frequency.

10. The method according to claim 1, in, The duration T1 of the first preset time period and the duration T2 of the first preset time period satisfy:

11. The method according to claim 1, in, In response to a first vertical synchronization signal sent by the logic board, before the step of receiving the complete backlight data sent by the logic board within a first preset time period, the method further includes: Collecting a second vertical synchronization signal corresponding to a plurality of picture frames before the current picture frame, and determining the frequency of a third vertical synchronization signal according to the frequency of the second vertical synchronization signal, wherein one cycle of the third vertical synchronization signal includes: a first preset time period and a second preset time period; The frequency of the third vertical synchronization signal is P times the frequency of the second vertical synchronization signal, where P is a positive integer.

12. The method according to claim 11, in, The value of P is 8.

13. A micro control unit, in, include: A processor and a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by the processor, the method according to any one of claims 1 to 12 is implemented.

14. A local backlight adjustment system, in, include: A logic board, a backlight driving module and a micro control unit as claimed in claim 13.

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