CN114927110A

CN114927110A - Backlight control method, display device, chip system and medium

Info

Publication number: CN114927110A
Application number: CN202210745345.4A
Authority: CN
Inventors: 刘岩; 刘西富; 王伟
Original assignee: Qingdao Xinxin Microelectronics Technology Co Ltd
Current assignee: Qingdao Xinxin Microelectronics Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-08-19
Anticipated expiration: 2042-06-27
Also published as: CN114927110B

Abstract

The embodiment of the application provides a backlight control method, a display device, a chip system and a medium, wherein each MCU acquires sub backlight data of each partition controlled by the MCU from an upstream module, the number of the acquired data is reduced, the load pressure of the MCU is reduced, and meanwhile, the efficiency of data transmission is improved.

Description

Backlight control method, display device, chip system and medium

Technical Field

The present disclosure relates to the field of Light Emitting Diode (LED) display technologies, and in particular, to a backlight control method, a display device, a chip system and a medium.

Background

In backlight Control of a display device, a Micro Control Unit (MCU) receives backlight data sent by a global backlight (local dimming) module in an upstream module, where the upstream module may be a System On Chip (SOC), a logic board (TCON), a Frame Rate Control (FRC), or the like. The MCU processes the received backlight data and sends the processed backlight data to a downstream module, thereby realizing the backlight function, wherein the downstream module can be a backlight driving chip and the like.

In the existing backlight design scheme of the display device, in order to improve the efficiency and quality of backlight control, a plurality of MCUs are generally cascaded, a display screen of the display device is partitioned, each MCU controls at least one partition, each partition is controlled by the corresponding MCU, and thus backlight control is realized through the cascaded MCUs.

Specifically, as shown in fig. 1, fig. 1 is a schematic diagram of backlight control provided in the prior art, and as shown in fig. 1, a display screen is divided into nine partitions, wherein

partitions

1, 2 and 3 are controlled by MCU1, partitions 4, 5 and 6 are controlled by MCU2, and partitions 7, 8 and 9 are controlled by MCU 3. In the upstream module, sub-backlight data corresponding to each partition is stored. In the prior art, when performing backlight control, full-screen backlight data composed of sub-backlight data of 9 partitions needs to be sent to each MCU, that is, each MCU needs to receive 9 sub-backlight data sent by upstream data. That is, in the prior art, each MCU in the cascade connection needs to receive full-screen backlight data composed of sub-backlight data of all partitions in the display screen, which results in a large amount of data received by each MCU and is prone to error. And if the MCU has an error when receiving the full-screen backlight data, the erroneous MCU performs backlight control using the full-screen backlight data of the previous frame image, resulting in poor backlight control effect.

Disclosure of Invention

The application provides a backlight control method, a display device, a chip system and a medium, which are used for solving the problems that in the prior art, due to the fact that the receiving of a certain MCU in cascade is abnormal to the full-screen backlight data, the backlight flicker or the brightness unevenness of the display device causes poor backlight control effect, and the use experience of a user is reduced.

In a first aspect, an embodiment of the present application provides a backlight control method, where the method includes:

the micro control unit MCU receives the sub backlight data of each partition controlled by the MCU and sent by the upstream module, and generates a sub-verification result corresponding to the MCU according to whether each sub backlight data passes the verification;

if the MCU is the first MCU in the cascade sequence, executing:

determining sub-average backlight data of each partition controlled by the MCU according to the sub-backlight data and the number of the partitions controlled by the MCU; sending the sub-average backlight data and the sub-verification result to the next MCU in the cascade sequence;

receiving first target average backlight data and a target verification result sent by the last MCU in the cascade sequence; the first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU, and the target verification result comprises a sub-verification result of each MCU;

and sending a backlight control instruction to each MCU in the cascade sequence according to the target verification result and the first target average backlight data, so that each MCU performs backlight control according to the backlight control instruction.

In a second aspect, an embodiment of the present application further provides a backlight control apparatus, where the apparatus includes:

the receiving module is used for receiving the sub backlight data of each partition controlled by the MCU, which is sent by the upstream module;

the verification module is used for generating a sub-verification result corresponding to the MCU according to whether each sub-backlight data passes verification;

a backlight control module, configured to execute, if the MCU is the first MCU in the cascade order: determining sub-average backlight data of each partition controlled by the MCU according to the sub-backlight data and the number of the partitions controlled by the MCU; sending the sub-average backlight data and the sub-verification result to the next MCU in the cascade sequence; receiving first target average backlight data and a target verification result sent by the last MCU in the cascade sequence; the first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU, and the target verification result comprises a sub-verification result of each MCU; and sending a backlight control instruction to each MCU in the cascade sequence according to the target verification result and the first target average backlight data, so that each MCU performs backlight control according to the backlight control instruction.

In a third aspect, an embodiment of the present application further provides a display device, where the display device includes:

a display screen;

a controller configured to perform the steps of the backlight control method as described in any one of the above.

In a fourth aspect, an embodiment of the present application further provides a chip system, where the chip system includes a memory and a processor, and the processor is coupled to the memory; wherein the memory includes program instructions which, when executed by the processor, cause the system-on-chip to perform the steps of any of the backlight control methods described above.

In a fifth aspect, embodiments of the present application further provide a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the backlight control method as described in any one of the above.

In the embodiment of the application, each MCU acquires each sub backlight data corresponding to each partition controlled by the MCU from the upstream module without acquiring sub backlight data of all partitions, so that the amount of acquired data is reduced, the load pressure of the MCU is reduced, and the data transmission efficiency is improved. In addition, in this embodiment of the application, after receiving each piece of sub-backlight data, the MCU verifies each piece of sub-backlight data and generates a sub-verification result corresponding to the MCU, and if the MCU is the first MCU in the cascade sequence, the MCU may acquire a target verification result including the sub-verification result of each MCU and first average backlight data, and send a backlight control instruction to each MCU in the cascade sequence, so that each MCU performs backlight control according to the backlight control instruction. In other words, in the embodiment of the present application, no matter whether there is an MCU in the cascade that receives abnormal sub-backlight data, each MCU in the cascade may perform backlight control according to the backlight control instruction of the first MCU, thereby avoiding backlight flicker or uneven brightness of the display device, improving the backlight control effect, and improving the use experience of the user.

Drawings

In order to more clearly explain the technical solutions of the present application, the drawings required for the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of backlight control provided by the prior art;

FIG. 2 is a schematic diagram of a usage scenario of a display device according to an embodiment;

fig. 3 shows a block diagram of the configuration of the control apparatus 100 according to an exemplary embodiment;

fig. 4 shows a hardware configuration block diagram of the display apparatus 200 according to an exemplary embodiment;

fig. 5 is a schematic diagram of a backlight control process according to an embodiment of the present disclosure;

fig. 6 is a schematic view of a display screen partition of a display device according to an embodiment of the present application;

fig. 7 is a schematic cascade diagram of MCUs provided in the embodiment of the present application;

FIG. 8 is a schematic diagram comparing the backlight control method according to the embodiment of the present application with that of the prior art;

FIG. 9 is an interaction diagram of an upstream module, an MCU and a downstream module provided in an embodiment of the present application;

fig. 10 is a schematic process diagram of backlight control of a first MCU in a cascade sequence according to an embodiment of the present application;

fig. 11 is a flowchart of a backlight control according to an embodiment of the present application;

FIG. 12 is a timing diagram illustrating the action of the first MCU in the cascade sequence within the control time of one frame of image according to the embodiment of the present application;

fig. 13 is a schematic diagram of each MCU in the display device performing backlight control according to the embodiment of the present application;

fig. 14 is a schematic diagram of backlight control when the target failure number of the target MCU does not exceed the preset failure number threshold according to the embodiment of the present application;

FIG. 15 is a diagram illustrating backlight control when a target failure number of a target MCU exceeds a preset failure number threshold according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a backlight control device according to some embodiments of the present application;

fig. 17 is a schematic structural diagram of a chip system according to some embodiments of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In order to avoid the situation that the display device has backlight flicker or uneven brightness, improve the effect of backlight control, and improve the use experience of a user, the embodiment of the application provides a backlight control method, a display device, a chip system and a medium.

The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.

The terms "comprises" and "comprising," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or device that comprises a list of elements is not necessarily limited to all of the elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.

The following describes a usage scenario of a display device according to some embodiments of the present application with reference to the drawings.

Fig. 2 is a schematic diagram of a usage scenario of a display device according to an embodiment. As shown in fig. 2, the display apparatus 200 is also in data communication with a server 400, and a user can operate the display apparatus 200 through the smart device 300 or the control device 100.

In some embodiments of the present application, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device includes at least one of an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, and the display device 200 is controlled by a wireless or wired method. The user may control the display apparatus 200 by inputting a user instruction through at least one of a key on a remote controller, a voice input, a control panel input, and the like.

In some embodiments of the present application, the smart device 300 may include any one of a mobile terminal, a tablet, a computer, a laptop, an AR/VR device, and the like.

In some embodiments, the smart device 300 may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device.

In some embodiments of the present application, the smart device 300 and the display device may also be used for data communication.

In some embodiments of the present application, the display device 200 may also be controlled by a manner other than the control apparatus 100 and the smart device 300, for example, the voice instruction control of the user may be directly received by a module configured inside the display device 200 to obtain a voice instruction, or may be received by a voice control apparatus provided outside the display device 200.

In some embodiments of the present application, the display device 200 is also in data communication with a server 400. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers.

In some embodiments of the present application, software steps executed by one step execution agent may be migrated to another step execution agent in data communication therewith for execution as needed. Illustratively, software steps performed by the server may be migrated on demand to be performed on the display device in data communication therewith, and vice versa.

Fig. 3 shows a block diagram of the configuration of the control apparatus 100 according to the exemplary embodiment. As shown in fig. 3, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface 140, a memory, and a power supply. The control apparatus 100 may receive an input operation instruction from a user and convert the operation instruction into an instruction recognizable and responsive by the display device 200, serving as an interaction intermediary between the user and the display device 200.

In some embodiments of the present application, the communication interface 130 is used for external communication, and includes at least one of a WIFI chip, a bluetooth module, NFC, or an alternative module.

In some embodiments of the present application, the user input/output interface 140 includes at least one of a microphone, a touch pad, a sensor, a key, or an alternative module.

Fig. 4 shows a hardware configuration block diagram of the display apparatus 200 according to an exemplary embodiment.

In some embodiments of the present application, the display apparatus 200 includes at least one of a tuner demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and a user interface 280.

In some embodiments of the present application, the controller includes a central processor, a video processor, an audio processor, a graphic processor, a RAM, a ROM, a first interface to an nth interface for input/output.

In some embodiments of the present application, the display 260 includes a display screen component for displaying pictures, and a driving component for driving image display, and is configured to receive image signals from the controller output, perform components for displaying video content, image content, and menu manipulation interface, perform user manipulation UI interface, and the like.

In some embodiments of the present application, the display 260 may be at least one of a liquid crystal display, an OLED display, and a projection display, and may also be a projection device and a projection screen.

In some embodiments of the present application, the tuner demodulator 210 receives a broadcast television signal through wired or wireless reception, and demodulates an audio/video signal, such as an EPG data signal, from a plurality of wireless or wired broadcast television signals.

In some embodiments of the present application, communicator 220 is a component for communicating with external devices or servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi module, a bluetooth module, a wired ethernet module, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver. The display apparatus 200 may establish transmission and reception of control signals and data signals with the control device 100 or the server 400 through the communicator 220.

In some embodiments of the present application, the detector 230 is used to collect signals of the external environment or interaction with the outside. For example, detector 230 includes a light receiver, a sensor for collecting ambient light intensity; alternatively, the detector 230 includes an image collector, such as a camera, which may be used to collect external environment scenes, attributes of the user, or user interaction gestures, or the detector 230 includes a sound collector, such as a microphone, which is used to receive external sounds.

In some embodiments of the present application, the external device interface 240 may include, but is not limited to, the following: high Definition Multimedia Interface (HDMI), analog or data high definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, and the like. Or may be a composite input/output interface formed by the plurality of interfaces.

In some embodiments of the present application, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

In some embodiments of the present application, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in the memory. The controller 250 controls the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting a UI object displayed on the display 260, the controller 250 may perform an operation related to the object selected by the user command.

In some embodiments of the present application, the object may be any one of selectable objects, such as a hyperlink, an icon, or other actionable control. The operations related to the selected object are: displaying an operation of connecting to a hyperlink page, document, image, etc., or performing an operation of a program corresponding to the icon.

In some embodiments of the present application, the controller includes at least one of a Central Processing Unit (CPU), a video processor, an audio processor, a Graphics Processing Unit (GPU), a RAM Random Access Memory (RAM), a ROM (Read-Only Memory), a first interface to an nth interface for input/output, a communication Bus (Bus), and the like.

A CPU processor. For executing operating system and application program instructions stored in the memory, and executing various application programs, data and contents according to various interactive instructions receiving external input, so as to finally display and play various audio-video contents. The CPU processor may include a plurality of processors. E.g., comprising a main processor and one or more sub-processors.

In some embodiments of the present application, a graphics processor for generating various graphics objects, such as: at least one of an icon, an operation menu, and a user input instruction display figure. The graphic processor comprises an arithmetic unit, which performs operation by receiving various interactive instructions input by a user and displays various objects according to display attributes; the system also comprises a renderer for rendering various objects obtained based on the arithmetic unit, wherein the rendered objects are used for being displayed on a display.

In some embodiments of the present application, the video processor is configured to receive an external video signal, and perform at least one of video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, and image synthesis according to a standard codec protocol of the input signal, so as to obtain a signal displayed or played on the direct display apparatus 200.

In some embodiments of the present application, the video processor includes at least one of a demultiplexing module, a video decoding module, an image synthesizing module, a frame rate conversion module, a display formatting module, and the like. The demultiplexing module is used for demultiplexing the input audio and video data stream. And the video decoding module is used for processing the video signal after demultiplexing, including decoding, scaling and the like. And the image synthesis module is used for carrying out superposition mixing processing on the GUI signal input by the user or generated by the user and the video image after the zooming processing by the graphic generator so as to generate an image signal for display. And the frame rate conversion module is used for converting the frame rate of the input video. And the display formatting module is used for converting the received video output signal after the frame rate conversion, and changing the signal to be in accordance with the signal of the display format, such as outputting an RGB data signal.

In some embodiments of the present application, the audio processor is configured to receive an external audio signal, perform at least one of decompression and decoding according to a standard codec protocol of the input signal, and perform noise reduction, digital-to-analog conversion, and amplification processing to obtain an audio signal that can be played in the speaker.

In some embodiments of the present application, the user may input a user command on a Graphical User Interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through the sensor.

In some embodiments of the present application, a "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables conversion between an internal form of information and a user-acceptable form. A commonly used presentation form of the User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the display screen of the electronic device, where the control may include at least one of an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc. visual interface elements.

In some embodiments of the present application, the user interface 280 is an interface (e.g., physical buttons on the body of the display device, or the like) that can be used to receive control inputs.

In some embodiments of the present application, a system of a display device may include a Kernel (Kernel), a command parser (shell), a file system, and an application. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.

In this embodiment of the present application, the controller of the display device is further configured to perform backlight control, specifically, as shown in fig. 5, fig. 5 is a schematic diagram of a backlight control process provided in this embodiment of the present application, where the process includes:

s501: and the MCU receives each sub backlight data corresponding to each partition controlled by the MCU and sent by the upstream module, and generates a sub-verification result corresponding to the MCU according to whether each sub backlight data passes verification.

The backlight control method provided by the embodiment of the application is applied to the MCU, wherein the MCU is positioned in the display equipment.

In the embodiment of the present application, a display screen in a display device is pre-divided into a plurality of partitions, the display device further stores a plurality of MCUs, each MCU controls a different partition, and the number of partitions controlled by each MCU may be the same or different. Fig. 6 is a schematic view of a display screen partition of a display device according to an embodiment of the present application, and as shown in fig. 6, the display screen is divided into 16 partitions. For each MCU, the display device pre-stores the corresponding relation between the MCU and the partition controlled by the MCU, wherein the partition 1-the partition 4 are controlled by the MCU _1, the partition 5-the partition 8 are controlled by the MCU _2, the partition 9-the partition 12 are controlled by the MCU _3, and the partition 13-the partition 16 are controlled by the MCU _ 4.

In the embodiment of the present application, MCUs of a display device are daisy-chained together by a Serial Peripheral Interface (SPI), and the SPI daisy-chain is used for data interaction between the MCUs.

Fig. 7 is a schematic diagram of a cascade connection of MCUs provided in the embodiment of the present application, and as shown in fig. 7, a display device includes MCU _1, … …, and MCU _ M, where MCU _1 is connected to MCU _2 through an SPI daisy chain, MCU _2 is connected to MCU _3 through an SPI daisy chain, and MCU _ M is connected to MCU _1 through an SPI daisy chain.

In the prior art, each MCU in the cascade controls at least one different partition, each MCU receives sub-backlight data of all partitions of the display device during backlight control, and the display device includes multiple partitions, which means that the data amount transmitted by the upstream module and the MCU is too large, resulting in too heavy load on the upstream module and the MCU. In the embodiment of the application, in order to reduce the load pressure of the MCU, the MCU only acquires each sub-backlight data corresponding to each partition controlled by the MCU from the upstream module without acquiring sub-backlight data of all partitions, thereby reducing the amount of acquired data.

Specifically, in this embodiment of the present application, the upstream module stores therein each sub backlight data corresponding to each partition, and also stores therein a correspondence between each partition and an MCU, and for each frame of image, the upstream module sends to each MCU in the display device each sub backlight data corresponding to each partition controlled by the MCU. After receiving each sub backlight data corresponding to each partition controlled by the MCU and sent by the upstream module, the MCU checks each sub backlight data according to a pre-stored check rule. After the MCU checks each sub backlight data, generating a sub-checking result corresponding to the MCU according to whether each sub backlight data passes the check.

In addition, in this embodiment of the application, if a time interval between a time when the MCU receives the sub backlight data and a time when the MCU receives the sub backlight data last time exceeds a preset time threshold, the MCU determines that the verification of each sub backlight data fails, and generates a sub verification result corresponding to the MCU.

S502: if the MCU is the first MCU in the cascade sequence, executing:

determining sub-average backlight data of each partition controlled by the MCU according to the sub-backlight data and the number of the partitions controlled by the MCU; and sending the sub-average backlight data and the sub-verification result to the next MCU in the cascade sequence.

Since the MCU only receives sub backlight data of each partition controlled by the MCU, in actual backlight control, the MCU needs to perform backlight control based on average backlight data of each partition in a display screen of the display device. Therefore, in this embodiment of the present application, if the MCU is the first MCU in the cascade order, the MCU calculates sub-average backlight data of each sub-area controlled by the MCU according to each received sub-backlight data and the number of sub-areas controlled by the MCU, and sends the average sub-backlight data to the next MCU in the cascade order, so that the next MCU calculates sub-average backlight data of its own MCU and its previous MCU according to the sub-average backlight data and each sub-backlight data received by itself, and continues to send the sub-average backlight data according to the cascade order.

In addition, in order to avoid the situation that the sub backlight data in the display device fails to be verified, which causes backlight flicker or uneven brightness of the display device during backlight control, in this embodiment of the application, if the MCU is the first MCU in the cascade sequence, the MCU further sends the sub verification result of the MCU to the next MCU in the cascade sequence, so that the next MCU can determine the verification condition of the MCU on each received sub backlight data. And the next MCU will continue to send the received sub-verification result of the MCU and the sub-verification result of the next MCU according to the cascade order.

S503: receiving first target average backlight data and a target verification result sent by the last MCU in the cascade sequence; the first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU in the cascade order, and the target verification result comprises a sub-verification result of each MCU in the cascade order.

In this embodiment of the present application, the last MCU in the cascade order obtains a sub-verification result of each MCU in the cascade order, and the sub-verification result including each MCU in the cascade order in the last MCU in the cascade order is referred to as a target verification result, where the target verification result includes the sub-verification result of each MCU in the cascade order.

Furthermore, in the embodiment of the present application, the last MCU in the cascade order determines average backlight data of all the partitions in the display screen of the display device based on the sub-backlight average data of each MCU in the cascade order. In the embodiment of the present application, the average backlight data of all the partitions in the display screen determined by the last MCU in the cascade order is referred to as first target average backlight data. Wherein the first target average backlight data is an average value of sub backlight data of each partition controlled by each MCU in the cascade order.

S504: and sending a backlight control instruction to each MCU in the cascade sequence according to the target verification result and the first target average backlight data, so that each MCU performs backlight control according to the backlight control instruction.

In this embodiment of the application, if the MCU is the first MCU in the cascade order, the MCU receives the first target average backlight data and the target verification result sent by the last MCU in the cascade order. And the MCU determines whether the MCU which fails to be verified exists currently according to each sub-verification result corresponding to each MCU carried in the target verification result, and the first MCU sends a backlight control instruction to each MCU in the cascade sequence according to different conditions, so that each MCU performs backlight control according to the backlight control instruction.

Specifically, in the embodiment of the present application, according to the first target average backlight data, second target average backlight data used by each MCU in backlight control is determined. After the MCU determines second target average backlight data, the MCU sends a backlight control instruction carrying the second target average backlight data to each MCU in the cascade order, so that each MCU performs backlight control according to the second target average backlight data. The second target average backlight data may be the first target average backlight data in the embodiment of the present application.

In the embodiment of the present application, when the MCU sends the backlight control command to each MCU in the cascade sequence, the backlight control command is performed based on the SPI daisy chain between the MCUs. Specifically, if the MCU is the first MCU in the cascade sequence, the MCU sends the backlight control command to the second MCU in the cascade sequence through the SPI daisy chain, and the second MCU sends the backlight control command to the third MCU in the cascade sequence, and so on until the last MCU receives the backlight control command.

That is, in the embodiment of the present application, each MCU may acquire each sub backlight data corresponding to each partition controlled by the MCU from the upstream module without acquiring sub backlight data of all partitions, so that the amount of acquired data is reduced, the load pressure of the MCU is reduced, and the efficiency of data transmission is improved. In addition, in the embodiment of the present application, after receiving each piece of sub backlight data, the MCU verifies each piece of sub backlight data, and generates a sub verification result corresponding to the MCU. If the MCU is the first MCU in the cascade sequence, the MCU may obtain a target verification result including a sub-verification result of each MCU and first average backlight data, and send a backlight control instruction carrying second target average backlight data to each MCU in the cascade sequence according to the target verification result and the first average backlight data, so that each MCU performs backlight control according to the second target average backlight data. In other words, in the embodiment of the present application, no matter whether an MCU with abnormal sub-backlight data reception exists in the cascade, each MCU in the cascade can perform backlight control according to the backlight control instruction of the first MCU, so that the situation of backlight flicker or uneven brightness of the display device is avoided, the backlight control effect is improved, and the use experience of the user is improved.

Fig. 8 is a schematic diagram comparing the backlight control method of the embodiment of the present application with that of the prior art, and as shown in fig. 8, the display screen is divided into nine partitions, where

partitions

1, 2 and 3 are controlled by MCU1, partitions 4, 5 and 6 are controlled by MCU2, and partitions 7, 8 and 9 are controlled by MCU 3. And, the sub backlight data corresponding to each partition is stored in the upstream module. In the prior art, when performing backlight control, the upstream module needs to send full-screen backlight data composed of sub-backlight data of 9 partitions to each MCU, that is, each MCU needs to receive 9 sub-backlight data sent by the upstream data. In this embodiment, the upstream module only needs to send the sub backlight data of the partition controlled by each MCU to each MCU, that is, each MCU only receives 3 sub backlight data sent by the upstream module.

In order to implement the verification of each piece of sub-backlight data received by the MCU and generate a sub-verification result corresponding to the MCU, on the basis of the foregoing embodiment, in this embodiment, the generating a sub-verification result corresponding to the MCU according to whether each piece of sub-backlight data passes the verification includes:

acquiring the data format requirement of the sub backlight data stored by the MCU;

if the data format of each sub backlight data meets the data format requirement, adding a first identifier which is stored in advance and used for successfully verifying the identifier to a bit corresponding to the MCU in a preset field to obtain a sub verification result corresponding to the MCU;

and if the data format of at least one piece of sub backlight data does not meet the data format requirement, adding a pre-stored second identifier for identifier verification failure to a bit corresponding to the MCU in a preset field to obtain a sub verification result corresponding to the MCU.

In the embodiment of the present application, the MCU stores the data format requirement of the sub-backlight data, where the data format requirement may specify the data format of the received sub-backlight data, and other content, such as the data range of the sub-backlight data, may be added to the data format requirement according to the actual application scenario, which is not limited herein.

In this embodiment of the application, the MCU may determine whether each sub backlight data received by the MCU passes the verification according to the data format requirement. If the MCU determines that the data format of each sub backlight data meets the data format requirement, the MCU determines that each sub backlight data is successfully verified, adds a first identifier which is pre-stored and used for successfully verifying the identifier to a position corresponding to the MCU in a preset field, and determines the preset field added with the first identifier as a sub verification result corresponding to the MCU.

In addition, in this embodiment of the application, if the MCU determines that the data format of at least one piece of sub-backlight data in each piece of sub-backlight data does not meet the data format requirement, the MCU determines that the verification of each piece of sub-backlight data fails, the MCU adds a second identifier, which is pre-stored and is used to identify the verification failure, to a bit corresponding to the MCU in a preset field, and determines the preset field to which the second identifier is added as a sub-verification result corresponding to the MCU.

Specifically, in the embodiment of the present application, a preset field is stored in the MCU, and a corresponding bit of the MCU in the preset field is stored, where the number of bits of the preset character is not less than the total number of MCUs included in the display device. After the MCU determines that the verification of each sub backlight data is successful, adding a first identifier which is saved in advance and used for identifying the successful verification into the bit; and after the MCU determines that the verification of each piece of sub backlight data fails, adding a second identifier which is saved in advance and used for identifying the verification failure into the bit. Wherein, the first label is generally "1", and the second label is generally "0".

In this embodiment of the application, when the preset first identifier or the second identifier is added to the corresponding bit, the MCU stores the position information of the bit corresponding to the MCU, and the MCU may add the first identifier or the second identifier to the bit corresponding to the position information. In addition, the left shift algorithm may be used for determining, specifically, the formula 1 < N or 0 < N may be used, the first identifier or the second identifier is added to the bits corresponding to the position information, and N is a serial number of the MCU in the cascade order, that is, 1 or 0 is added to the nth bit from the right of the preset character.

In order to implement backlight control of a display screen of a display device, on the basis of the foregoing embodiments, in an embodiment of the present application, the sending a backlight control instruction to each MCU in the cascade order according to the target verification result and the first target average backlight data includes:

if the sub-verification results corresponding to each MCU in the target verification result are verified successfully, transmitting a backlight control instruction carrying the first target average backlight data to each MCU in the cascade sequence;

if the sub-verification result corresponding to at least one MCU in the target verification result is verification failure, determining the target MCU with verification failure; acquiring the saved target failure times of the target MCU, and updating the target failure times; and sending a backlight control instruction to each MCU in the cascade sequence according to the updated target failure times.

In this embodiment of the application, if the sub-verification result corresponding to each MCU in the target verification results obtained by the MCU from the last MCU in the cascade order is successful, the MCU determines that there is no MCU in the display device with failed sub-backlight data verification, and sends a backlight control instruction carrying the first target average backlight data to each MCU in the cascade order.

Specifically, in this embodiment of the present application, the target verification result obtained by the MCU is a field, each bit of the field corresponds to one MCU, each bit corresponds to one identifier, and the identifier may be a first identifier indicating that verification is successful or a second identifier indicating that verification is failed. And if the MCU identifies that each bit of the target verification result is the first identifier, determining that the sub-verification results corresponding to each MCU are verification success.

For example, in this embodiment of the present application, if there are 6 MCUs in the display device, a first identifier used for identifying successful verification is 1, and a target verification result obtained by the MCU from the last MCU is 111111b, and the MCU determines that all sub-verification results corresponding to each MCU are successful in verification, the MCU receives first target average backlight data from the last MCU, and sends a backlight control instruction carrying the first target average backlight data to each MCU in the cascade order.

In this embodiment of the application, in the target verification result obtained by the MCU from the last MCU in the cascade order, if at least one sub-verification result that is a verification failure exists in the sub-verification results corresponding to each MCU, the MCU determines that an MCU with a verification failure of the sub-backlight data exists in the display device, and the MCU determines the target MCU with a verification failure. In addition, the MCU also stores the failure frequency of each MCU, and the MCU can obtain the stored target failure frequency of the target MCU and update the target failure frequency. And sending a backlight control instruction to each MCU in the cascade sequence according to the updated target failure times.

Specifically, in this embodiment of the present application, if the MCU recognizes that the content in at least one bit of the target verification result is the second identifier, the MCU determines that the content is the target bit of the second identifier, and determines the target MCU corresponding to the target bit according to the pre-stored correspondence between the bit and the MCU.

For example, in this embodiment of the present application, if there are 6 MCUs in the display device, the first identifier for identifying that the verification is successful is 1, the second identifier for identifying that the verification is failed is 0, the target verification result obtained by the MCU from the last MCU is 111110b, the content in the last bit is the second identifier, and the target MCU corresponding to the last bit is determined according to the correspondence between the bits stored in advance and the MCUs.

In order to further implement backlight control on a display screen of a display device, on the basis of the foregoing embodiments, in this embodiment of the application, the sending a backlight control instruction to each MCU in the cascade sequence according to the updated target failure times includes:

if the updated target failure times do not exceed a preset failure time threshold, acquiring stored first identification information for performing backlight control by using second average backlight data corresponding to a previous frame of image, identifying a current receiving error level by using the first identification information, and sending a backlight control instruction carrying the receiving error level to each MCU in the cascade sequence;

if the updated target failure times exceed the preset failure time threshold, obtaining second identification information which is stored and uses global backlight to perform backlight control, identifying the current receiving error level by using the second identification information, and sending a backlight control instruction carrying the receiving error level to each MCU in the cascade sequence.

In the embodiment of the application, if the updated target failure times of the target MCU do not exceed the preset failure time threshold, the MCU obtains the stored first identification information for performing backlight control by using the second average backlight data corresponding to the previous frame of image, identifies the current reception error level by using the first identification information, and sends a backlight control instruction carrying the reception error level to each MCU in the cascade sequence. In the embodiment of the present application, the preset time threshold may be set by a technician according to an actual application scenario, and if the application scenario has a high requirement on backlight control, the preset time threshold may be set to be smaller. Typically, the predetermined failure threshold is 10 times.

Specifically, in the embodiment of the present application, the MCU may determine the current receiving error level of the display device according to the size relationship between the updated target failure frequency and the preset failure frequency threshold.

Specifically, in the embodiment of the present application, if the target failure frequency after the target MCU is updated does not exceed the preset failure frequency threshold, it is considered that the MCU in the display device occasionally has an error in received sub-backlight data, and at this time, the MCU identifies the current reception error level by using preset first identification information, where the first identification information indicates that the current reception error level is low. Wherein, the reception error LEVEL is represented by RX _ ERR _ LEVEL, and the reception error LEVEL identified by the preset first identification information is RX _ ERR _ LEVEL ═ 1. And the MCU transmits the receiving error grade carrying the first identification information to each other MCU based on the SPI daisy chain. And after each MCU receives the receiving error grade carrying the first identification information, each MCU does not calculate backlight data, but adopts second average backlight data of the previous frame of image to control backlight.

In addition, in the embodiment of the present application, if the updated target failure number of the target MCU exceeds the preset failure number threshold, the MCU obtains the stored second identification information for performing backlight control using the global backlight, identifies the current reception error level using the second identification information, and sends a backlight control instruction carrying the reception error level to each MCU in the cascade order.

Specifically, in the embodiment of the present application, if the updated target failure frequency of the target MCU exceeds the preset failure frequency threshold, it is determined that the MCU in the display device frequently has an error condition of the received sub-backlight data, and at this time, the MCU identifies the current reception error level by using preset second identification information, where the second identification information indicates that the current reception error level is the highest. Wherein, the reception error LEVEL is denoted by RX _ ERR _ LEVEL, and the reception error LEVEL identified by the preset second identification information is RX _ ERR _ LEVEL equal to 2. The MCU also sends a backlight control instruction carrying the receiving error grade of the second identification information to each other MCU based on the SPI daisy chain. And after each MCU receives the receiving error level carrying the second identification information, each MCU does not calculate backlight data, but adopts the global backlight to control the backlight of the partition controlled by each MCU.

In the embodiment of the application, if the target failure frequency after the target MCU is updated exceeds the preset failure frequency threshold, the MCU sends alarm information that the target failure frequency after the target MCU is updated exceeds the preset failure frequency threshold to the upstream module, so that the upstream module can alarm for the condition.

Fig. 9 is an interaction schematic diagram of an upstream module, an MCU, and a downstream module provided in an embodiment of the present application, where as shown in fig. 9, each MCU in a display device is connected through an SPI daisy chain, and the upstream module is connected with each MCU respectively, and each MCU is connected with the downstream module respectively.

In order to further improve the effect of backlight control, on the basis of the foregoing embodiments, in this application embodiment, after each sub-verification result in the target verification result is successfully verified, the method further includes:

the MCU updates the target success times of each successful sub-verification result; and if the updated target failure times exceed the preset success time threshold, setting the stored failure times corresponding to each MCU as preset times.

In the embodiment of the application, after each sub-verification result in the target verification result is verified successfully, the MCU acquires the saved target success times of each successful sub-verification result, and updates the target success times; if the updated target success frequency exceeds the preset success frequency threshold, the MCU determines that the risk of the current receiving failure of each MCU is reduced, and the MCU sets the stored failure frequency corresponding to each MCU as the preset frequency. Generally, the preset number of times is 0, that is, the number of times of failure corresponding to each MCU to be saved is cleared.

At this time, in this embodiment of the present application, the MCU identifies the current receiving error level by using preset third identification information, where the third identification information indicates that the current receiving error level is the lowest. The MCU also sends a receiving error grade carrying the third identification information and a backlight control instruction carrying second target average backlight data to each MCU based on the SPI daisy chain.

Fig. 10 is a schematic diagram of a process of backlight control of a first MCU in a cascade sequence according to an embodiment of the present application, where as shown in fig. 10, the process includes:

s1001: and if each sub-verification result in the target verification result is verified successfully, acquiring the target success times of each saved sub-verification result, and updating the target success times.

For example, in the embodiment of the present application, if the display device determines that each sub-verification result is successful in verification, the target success frequency for obtaining each saved sub-verification result is 5 times, the display device updates the target success frequency, and updates the target success frequency to 6 times.

S1002: and if the updated target success times exceed a preset success time threshold, setting the stored failure times corresponding to each MCU as preset times.

In this embodiment of the present application, the preset success number threshold stored in the display device is 5 times, and if the display device determines that the updated target success number exceeds the preset success number threshold, the display device sets the stored failure number corresponding to each MCU to 0.

S1003: and sending a receiving error grade carrying the third identification information and a backlight control instruction carrying second target average backlight data to each MCU.

In the embodiment of the application, the display device identifies the current receiving error level by using preset third identification information, wherein the third identification information indicates that the current receiving error level is the lowest. And the display device sends a receiving error grade carrying third identification information and a backlight control instruction carrying second target average backlight data to each MCU.

S1004: and determining backlight data of each partition controlled by the MCU based on the second target average backlight data.

In the embodiment of the present application, after receiving the reception error level and the second target average backlight data, the MCU calculates the backlight data of each partition controlled by the MCU according to the second target average backlight data.

S1005: and sending each backlight data to a downstream module.

In order to further improve the effect of backlight control, on the basis of the foregoing embodiments, in this application embodiment, if the MCU is a non-first MCU in the cascade order, the method further includes:

receiving first target average backlight data and a target verification result sent by a last MCU in the cascade order;

if the MCU passes the verification of each sub backlight data, updating the first target average backlight data according to each sub backlight data; updating the target verification result according to the sub-verification result of each sub-backlight data; sending the updated first average backlight data and the updated target verification result to the next MCU in the cascade sequence;

if the MCU fails to verify each sub backlight data, updating the target verification result according to the sub verification result of each sub backlight data; and sending the first target average backlight data and the updated target verification result to the next MCU in the cascade sequence.

In this embodiment of the present application, if an MCU is not the first MCU in the cascade order, the MCU receives the first target average backlight data and the target verification result sent by the last MCU in the cascade order. And if each sub backlight data of the MCU passes the verification, updating the first target average backlight data according to the sub backlight data of each subarea controlled by the MCU.

Specifically, in this embodiment, the MCU may update the first target average backlight data according to the following formula: APL '(APL × (the number of partitions controlled by MCU _1 to MCU _ N-1) + APL _ N × (the number of partitions controlled by MCU _ N))/(the number of partitions controlled by MCU _1 to MCU _ N), where APL' is the updated first target average backlight data, APL is the received first average backlight data, MCU _ N is the MCU, MCU _1 is the first MCU in the cascade order, MCU _ N-1 is the last MCU of the MCU, and APL _ N is the sub-backlight data received by the MCU, and in this embodiment, the sub-backlight data of each partition controlled by the MCU are the same.

In addition, in the embodiment of the present application, the MCU may further update the received target verification result, and add the sub-verification result corresponding to the MCU to the target verification result.

In the embodiment of the present application, if each sub backlight data of the MCU passes verification, the MCU sends the updated first target average backlight data and the updated target verification result to the next MCU in the cascade sequence. If the verification of each sub backlight data of the MCU is not verified, the MCU does not update the first target average backlight data, only updates the target verification result, and sends the received first target average backlight data and the updated target verification result to the next MCU in the cascade sequence.

In order to achieve the updating of the target verification result and improve the effect of backlight control, on the basis of the foregoing embodiments, in this embodiment of the application, the updating the target verification result according to the sub-verification result for each piece of sub-backlight data includes:

and carrying out bit OR operation on the sub-verification result of each sub-backlight data and the corresponding bit in the target verification result, and updating the target verification result by using the operation result.

In this embodiment of the application, if each piece of sub-backlight data of the MCU passes verification, the sub-verification result is a first identifier, and if each piece of sub-backlight data does not pass verification, the sub-verification result is a second identifier. When the MCU updates the target verification result according to the sub-verification result, the MCU may perform bit or operation on the sub-verification result and corresponding bits in the target verification result, and update the target verification result using the operation result.

Specifically, in the embodiment of the present application, the MCU may perform bit or operation by using the following formula: RX _ FLAG '═ RX _ FLAG | RX _ FLAG _ N, where RX _ FLAG _ N represents a sub-check result of the MCU, RX _ FLAG represents a target check result received by the MCU, and RX _ FLAG' represents a target check result updated by the MCU.

Fig. 11 is a flowchart of a backlight control according to an embodiment of the present application, and as shown in fig. 11, the process includes:

s1101: and the MCU receives each sub backlight data corresponding to each partition controlled by the MCU and sent by the upstream module.

In this embodiment of the present application, the upstream module stores each sub-backlight data corresponding to each partition, and also stores a correspondence between each partition and an MCU in the upstream module, and for each frame of image, the upstream module sends each sub-backlight data corresponding to each partition controlled by the MCU to each MCU in the display device.

S1102: and judging whether each piece of sub-backlight data passes the verification, if so, executing S1103, and if not, executing S1106.

After receiving each sub backlight data corresponding to each partition controlled by the MCU and sent by the upstream module, the MCU checks each sub backlight data respectively according to a pre-stored check rule. After the MCU checks each sub backlight data, generating a sub-checking result corresponding to the MCU according to whether each sub backlight data passes the check.

S1103: and determining sub-average backlight data of each partition controlled by the MCU according to the sub-backlight data and the number of the partitions controlled by the MCU.

And if the MCU is the first MCU in the cascade sequence, the MCU calculates the sub-average backlight data of each partition controlled by the MCU according to the received sub-backlight data and the number of the partitions controlled by the MCU.

S1104: and adding a first identifier which is stored in advance and used for successfully verifying the identifier to a preset field and corresponding to the MCU to obtain a sub-verification result corresponding to the MCU.

When the MCU generates a sub-verification result corresponding to the MCU according to whether each piece of sub-backlight data passes the verification or not, if the MCU determines that the data format of each piece of sub-backlight data meets the requirement of the data format, the MCU determines that each piece of sub-backlight data is successfully verified, adds a first identifier which is stored in advance and used for successfully verifying the identifier into a position corresponding to the MCU in a preset field, and determines the preset field added with the first identifier as the sub-verification result corresponding to the MCU.

For example, in this embodiment of the application, the first flag is "1", the preset field is 00000000, and the bit corresponding to the MCU is the third bit from the left, so that the first sub-verification result corresponding to the MCU is 00000100.

S1105: the sub-verification result and the sub-average backlight data are sent to the next MCU in the cascade order, and S1108 is performed.

If the MCU is the first MCU in the cascade sequence, the MCU also sends the sub-verification result of the MCU to the next MCU in the cascade sequence, so that the next MCU can determine the verification condition of the MCU on each received sub-backlight data. And the next MCU will continue to send the received sub-verification result of the MCU and the sub-verification result of the next MCU according to the cascade order.

S1106: and adding a second identifier which is stored in advance and used for identifying verification failure to a preset field and corresponding to the MCU to obtain a sub-verification result corresponding to the MCU.

When the MCU generates a sub-verification result corresponding to the MCU according to whether each sub-backlight data passes the verification or not, if the MCU determines that the data format of at least one sub-backlight data in each sub-backlight data does not meet the data format requirement, the MCU determines that the verification of each sub-backlight data fails, the MCU adds a second identifier which is pre-stored and used for identifying the verification failure to a bit corresponding to the MCU in a preset field, and determines the preset field added with the second identifier as the sub-verification result corresponding to the MCU.

For example, in this embodiment of the application, the second flag is "0", the preset field is 00000000b, the bit corresponding to the MCU is the third bit counted from the left, and the first sub-verification result corresponding to the MCU is 00000000 b.

S1107: the sub-verification result is sent to the next MCU in the cascade order, and S1108 is performed.

S1108: and the first MCU in the cascade receives the first target average backlight data and the target verification result sent by the last MCU in the cascade sequence.

If the MCU is the first MCU in the cascade order, the MCU receives the first target average backlight data and the target verification result sent by the last MCU in the cascade order. The first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU in the cascade order, and the target verification result comprises a sub-verification result of each MCU in the cascade order.

S1109: and sending a backlight control instruction to each MCU in the cascade sequence according to the target verification result and the first target average backlight data, so that each MCU performs backlight control according to the backlight control instruction.

And the MCU determines whether the MCU which fails in verification exists currently according to each sub-verification result corresponding to each MCU carried in the target verification result, and sends a backlight control instruction to each MCU in the cascade sequence according to different conditions, so that each MCU performs backlight control according to the backlight control instruction.

Fig. 12 is a timing chart of actions of a first MCU in the cascade sequence in the control time of one frame image according to the embodiment of the present application, and as shown in fig. 12, the first MCU divides the control time of one frame image into 6 time segments, which are t1, t2, t3, t4, t5, and t6 respectively. Receiving sub backlight data of each partition controlled by a first MCU sent by an upstream module by the first MCU in a time period t 1; verifying each received sub-backlight data by the first MCU within a time period of t2 to generate a sub-verification result corresponding to the MCU, and determining sub-average backlight data of each partition controlled by the first MCU; in a time period of t3, the first MCU sends the sub-average backlight data and the sub-verification result to the next MCU in the cascade sequence, and receives the first average backlight data and the target verification result sent by the last MCU: the first MCU in the time period t4 sends a backlight control instruction carrying second target average backlight data to each MCU in the cascade sequence; calculating the backlight data of the partitions controlled by the first MCU according to the second average backlight data by the first MCU in the time period t 5; and transmitting the calculated backlight data to a downstream module by the first MCU within the time period of t 6.

Fig. 13 is a schematic diagram of each MCU in the display device performing backlight control according to the embodiment of the present application, and as shown in fig. 13, the process includes:

s1301: and the first MCU in the cascade sequence receives the first target average backlight data and the target verification result sent by the last MCU in the cascade sequence.

On the basis of fig. 12, the MCU determines whether there is an MCU with failed verification currently according to each sub-verification result corresponding to each MCU carried in the target verification result, and determines, for different situations, second target average backlight data used by each MCU in backlight control according to the first target average backlight data. After the MCU determines second target average backlight data, the MCU sends a backlight control instruction carrying the second target average backlight data to each MCU in the cascade order, so that each MCU performs backlight control according to the second target average backlight data.

S1302: the first MCU determines whether each sub backlight data passes the verification, and if yes, S1303 is executed.

The target verification result obtained by the MCU is a field, each bit of the field corresponds to an MCU, each bit corresponds to an identifier, and the identifier may be a first identifier indicating that verification is successful or a second identifier indicating that verification is failed. And if the MCU identifies that each bit of the target verification result is the first identifier, determining that the sub-verification results corresponding to each MCU are verification success.

For example, if the first identifier is "1" and the obtained target verification result is "11111111 b", the MCU determines that the sub-verification results corresponding to each MCU are all successful verifications.

S1303: the first MCU acquires the target success times of successfully storing each sub-verification result, and updates the target success times; and if the updated target failure times exceed the preset success time threshold, setting the stored failure times corresponding to each MCU as preset times.

S1304: and the first MCU adopts preset third identification information to identify the current receiving error grade, and sends a backlight control instruction carrying the receiving error grade of the third identification information to the next MCU in the cascade sequence based on the SPI daisy chain.

In the embodiment of the application, the display device identifies the current receiving error level by using preset third identification information, wherein the third identification information indicates that the current receiving error level is the lowest. And the display equipment sends a backlight control instruction carrying the receiving error grade of the third identification information to each MCU.

S1305: and each other MCU except the first MCU in the cascade sequence receives the backlight control command through the SPI daisy chain and sends the backlight control command to the next MCU in the cascade sequence.

In this embodiment, in order to enable the backlight control command to be sent to each MCU in the cascade sequence, each other MCU except the first MCU in the cascade sequence receives the backlight control command sent by the previous MCU through the SPI daisy chain, and sends the backlight control command to the next MCU in the cascade sequence.

S1306: and other MCUs perform backlight control based on the backlight control instruction.

In the embodiment of the application, after receiving the backlight control instruction carrying the receiving error level, the MCU performs backlight control according to the receiving error level.

Fig. 14 is a schematic diagram of backlight control when the target failure number of the target MCU does not exceed the preset failure number threshold according to the embodiment of the present application, as shown in fig. 14, the process includes:

s1401: and the first MCU determines a target MCU which fails in verification, acquires the stored target failure times of the target MCU and updates the target failure times.

In the embodiment of the application, if the first MCU determines that there is an MCU with failed verification in the target verification result. The first MCU determines the MCU which fails the verification as a target MCU, acquires the stored target failure times of the MCU, and updates the target failure times.

If the first MCU determines that the target failure times of the target MCU is 4, the first MCU updates the target failure times to 5.

S1402: and judging whether the updated failure times do not exceed a preset failure time threshold, if so, executing S1403.

In this embodiment of the present application, the preset failure number threshold stored in the display device is 5 times, and the first MCU determines that the target failure number of the target MCU does not exceed the preset failure number threshold.

S1403: the first MCU adopts preset first identification information to identify the current receiving error grade, and sends a backlight control instruction carrying the receiving error grade of the first identification information to the next MCU in the cascade sequence based on the SPI daisy chain.

And if the target failure times after the target MCU is updated do not exceed the preset failure time threshold, the MCU in the display equipment is considered to have the condition that the received sub backlight data are wrong occasionally. At this time, the MCU identifies the current receiving error level by using preset first identification information, where the first identification information indicates that the current receiving error level is low. And the MCU sends a backlight control instruction carrying the receiving error grade of the first identification information to each other MCU based on the SPI daisy chain.

S1404: each of the other MCUs in the cascade sequence except the first MCU receives the backlight control command through the SPI daisy chain and sends the backlight control command to the next MCU in the cascade sequence.

In this embodiment of the present application, in order to implement that the backlight control instruction may be sent to each MCU in the cascade order, each other MCU in the cascade order except the first MCU receives the backlight control instruction sent by the previous MCU through the SPI daisy chain, and sends the backlight control instruction to the next MCU in the cascade order.

S1405: and the other MCU sends the backlight data corresponding to the previous frame of image to the backlight driving chip.

Fig. 15 is a schematic diagram of backlight control when a target failure number of a target MCU exceeds a preset failure number threshold according to an embodiment of the present application, as shown in fig. 15, the process includes:

s1501: and the first MCU sends the updated failure times of the target MCU to the upstream module.

And if the first MCU determines that the target failure times of the target MCU exceed the preset failure time threshold, the first MCU sends the updated failure times of the target MCU to the upstream module, so that a technician can know the backlight control condition of the display equipment and perform corresponding processing.

S1502: the first MCU adopts preset second identification information to identify the current receiving error level, and transmits a backlight control instruction carrying the receiving error level of the second identification information to the next MCU in the cascade order based on the SPI daisy chain.

If the updated target failure times of the target MCU exceed the preset failure time threshold, the MCU adopts preset second identification information to identify the current receiving error level, wherein the second identification information indicates that the current receiving error level is higher. And the MCU sends a backlight control instruction carrying the receiving error grade of the first identification information to each other MCU based on the SPI daisy chain.

S1503: and each other MCU except the first MCU in the cascade sequence receives the backlight control command through the SPI daisy chain and sends the backlight control command to the next MCU in the cascade sequence.

S1504: the other MCUs perform backlight control based on full screen backlight.

Fig. 16 is a schematic structural diagram of a backlight control apparatus according to some embodiments of the present application, where the apparatus includes:

a receiving module 1601, configured to receive, by an MCU, the sub-backlight data of each partition controlled by the MCU and sent by an upstream module;

a checking module 1602, configured to generate a sub-checking result corresponding to the MCU according to whether each sub-backlight data passes the checking;

a backlight control module 1603, configured to, if the MCU is the first MCU in the cascade order, perform: determining sub-average backlight data of each partition controlled by the MCU according to the sub-backlight data and the number of the partitions controlled by the MCU; sending the sub-average backlight data and the sub-verification result to the next MCU in the cascade sequence; receiving first target average backlight data and a target verification result sent by the last MCU in the cascade sequence; the first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU, and the target verification result comprises a sub-verification result of each MCU; and sending a backlight control instruction to each MCU in the cascade sequence according to the target verification result and the first target average backlight data, so that each MCU performs backlight control according to the backlight control instruction.

In a possible implementation manner, the verification module 1602 is specifically configured to obtain a data format requirement of the sub backlight data stored by the MCU; if the data format of each sub backlight data meets the data format requirement, adding a first identifier which is stored in advance and used for successfully verifying the identifier to a bit corresponding to the MCU in a preset field to obtain a sub-verification result corresponding to the MCU; and if the data format of at least one piece of sub backlight data does not meet the data format requirement, adding a second identifier which is stored in advance and used for identifying verification failure to a bit corresponding to the MCU in a preset field to obtain a sub verification result corresponding to the MCU.

In a possible implementation manner, the backlight control module 1603 is specifically configured to send a backlight control instruction carrying the first target average backlight data to each MCU in the cascade order if the sub-verification results corresponding to each MCU in the target verification result are verified successfully; if the sub-verification result corresponding to at least one MCU in the target verification result is verification failure, determining the target MCU with verification failure; acquiring the stored target failure times of the target MCU, and updating the target failure times; and sending a backlight control instruction to each MCU in the cascade sequence according to the updated target failure times.

In a possible implementation manner, the backlight control module 1603 is specifically configured to, if the updated target failure number does not exceed a preset failure number threshold, obtain first identification information for performing backlight control by using second target average backlight data corresponding to a previous frame image, identify a current reception error level by using the first identification information, and send a backlight control instruction carrying the reception error level to each MCU in the cascade order; if the updated target failure times exceed the preset failure time threshold, obtaining second identification information which is stored and uses global backlight to perform backlight control, identifying the current receiving error level by using the second identification information, and sending a backlight control instruction carrying the receiving error level to each MCU in the cascade sequence.

In a possible embodiment, the apparatus further comprises:

the updating module 1604 is specifically configured to update the target success times of each saved sub-verification result that is successfully obtained by the MCU, and set the failure times corresponding to each saved MCU as the preset times if the updated target success times exceed a preset success time threshold.

In a possible implementation manner, the backlight control module 1603 is specifically configured to receive first target average backlight data and a target verification result sent by a last MCU in the cascade order; if the MCU passes the verification of each sub backlight data, updating the first target average backlight data according to each sub backlight data; updating the target verification result according to the sub-verification result of each sub-backlight data; sending the updated first average backlight data and the updated target verification result to the next MCU in the cascade order; if the MCU fails to verify each sub backlight data, updating the target verification result according to the sub verification result of each sub backlight data; and sending the first target average backlight data and the updated target verification result to the next MCU in the cascade sequence.

In a possible implementation manner, the backlight control module 1603 is specifically configured to perform a bit or operation on the sub-verification result of each sub-backlight data and the corresponding bit in the target verification result, and update the target verification result using the operation result.

Fig. 17 is a schematic structural diagram of a chip system according to some embodiments of the present application. The chip system includes one or more than two (including two) processors 1701 and a communication interface 1702.

Optionally, the system on a chip further includes a memory 1703, where the memory 1703 may include read-only memory and random access memory, and provides operating instructions and data to the processor. The portion of memory may also include non-volatile random access memory (NVRAM).

In some embodiments, as shown in FIG. 17, memory 1703 stores elements, execution modules, or data structures, or a subset or expanded set thereof.

As shown in fig. 17, in some embodiments of the present application, the corresponding operation is performed by calling an operation instruction stored in the memory 1703 (the operation instruction may be stored in an operating system).

As shown in fig. 17, a processor 1701, which may also be referred to as a Central Processing Unit (CPU), controls the processing operations of the head-end device.

As shown in fig. 17, memory 1703 may include both read-only memory and random-access memory, and provide instructions and data to the processor. A portion of the memory 1703 may also include NVRAM. Such as application-specific communication interfaces, and memory are coupled together by a bus system 1704, where the bus system 1704 may include a power bus, a control bus, and a status signal bus, among others, in addition to a data bus. For clarity of illustration, however, the various buses are designated in fig. 17 as the bus system 1704.

The methods disclosed in some embodiments of the present application may be applied to or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an ASIC, an FPGA (field-programmable gate array) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in some embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with some embodiments of the present application may be embodied directly in the hardware decoding processor, or in a combination of the hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

On the basis of the foregoing embodiments, the present application further provides a computer-readable storage medium, in which a computer program executable by an electronic device is stored, and when the program runs on the electronic device, the electronic device is caused to execute the method disclosed in some embodiments of the present application.

Since the principle of solving the problem of the computer-readable storage medium is similar to that of the backlight control method, the implementation of the computer-readable storage medium can refer to the embodiment of the method, and repeated descriptions are omitted.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Each flow and/or block in the flow charts and/or block diagrams, and combinations of flows and/or blocks in the flow charts and/or block diagrams, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such 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 intended to include such modifications and variations as well.

Claims

1. A method of backlight control, the method comprising:

if the MCU is the first MCU in the cascade sequence, executing:

receiving first target average backlight data and a target verification result sent by the last MCU in the cascade order; the first target average backlight data is an average value of sub-average backlight data of each partition controlled by each MCU, and the target verification result comprises a sub-verification result of each MCU;

2. The method according to claim 1, wherein the generating a sub-verification result corresponding to the MCU according to whether each sub-backlight data passes verification comprises:

if the data format of each sub backlight data meets the data format requirement, adding a first identifier which is stored in advance and used for successfully verifying the identifier to a bit corresponding to the MCU in a preset field to obtain a sub-verification result corresponding to the MCU;

3. The method according to claim 1 or 2, wherein the sending a backlight control command to each MCU in the cascade order according to the target verification result and the first target average backlight data comprises:

4. The method of claim 3, wherein the sending backlight control instructions to each MCU in the cascade order according to the updated target failure times comprises:

if the updated target failure times do not exceed a preset failure time threshold, acquiring stored first identification information for performing backlight control by using second target average backlight data corresponding to a previous frame of image, identifying a current receiving error level by using the first identification information, and sending a backlight control instruction carrying the receiving error level to each MCU in the cascade sequence;

and if the updated target failure times exceed the preset failure time threshold, acquiring stored second identification information for performing backlight control by using global backlight, identifying the current receiving error level by using the second identification information, and sending a backlight control instruction carrying the receiving error level to each MCU in the cascade sequence.

5. The method of claim 3, wherein after each sub-verification result in the target verification result is verified successfully, the method further comprises:

and the MCU updates the target success times of each saved sub-verification result, and if the updated target success times exceed a preset success time threshold, the failure times corresponding to each saved MCU are set as preset times.

6. The method of claim 1, wherein if the MCU is a non-first MCU in the cascade order, the method further comprises:

if the MCU fails to verify each sub backlight data, updating the target verification result according to the sub verification result of each sub backlight data; and sending the first target average backlight data and the updated target verification result to the next MCU in the cascade order.

7. The method of claim 6, wherein the updating the target verification result according to the sub-verification result for each sub-backlight data comprises:

8. A display device, characterized in that the display device comprises:

a display;

a controller configured to perform the steps of the backlight control method as claimed in any one of claims 1 to 7.

9. A chip system comprising a memory and a processor, the processor and the memory coupled; wherein the memory includes program instructions which, when executed by the processor, cause the system-on-chip to perform the steps of the backlight control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that it stores a computer program which, when being executed by a processor, carries out the steps of the backlight control method according to any one of claims 1 to 7.