CN112992080B

CN112992080B - Display device and protection method thereof

Info

Publication number: CN112992080B
Application number: CN202110179328.4A
Authority: CN
Inventors: 杜强; 张玉欣; 刘广学
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2022-06-10
Anticipated expiration: 2041-02-09
Also published as: WO2022170825A1; CN112992080A

Abstract

The embodiment of the application provides a display device and a protection method thereof, wherein the display device comprises a processor, a PWM driver, a DC/DC converter and a multi-channel backlight source; the PWM driver is used for driving each path of backlight source by a preset constant current value and feeding back a driving voltage value required by each path of backlight source to the processor; the processor is used for adjusting the output voltage value of the DC/DC converter to a target driving voltage value according to the driving voltage value required by each path of backlight source fed back by the PWM driver, wherein the target driving voltage value is the maximum driving voltage value in the driving voltage values required by each path of backlight source; when the target driving voltage value is greater than or equal to the preset voltage threshold value, if the working current of each path of backlight source is smaller than the preset constant current value, the preset protection measure is started, so that the backlight module can be prevented from being damaged due to abnormal conditions such as poor plugging and unstable power supply voltage.

Description

Display device and protection method thereof

Technical Field

The embodiment of the application relates to the technical field of display equipment, in particular to display equipment and a protection method thereof.

Background

At present, the market share of LED backlight liquid crystal display devices has increased dramatically, and has gradually occupied the display field from low end to high end, becoming a hot spot in the market of display devices.

The LED backlight lcd apparatus generally includes an lcd panel and a backlight module, and the backlight module generally includes a plurality of backlight sources. However, the multi-backlight sources in the conventional backlight module usually adopt a common anode driving method to form a plurality of backlight partitions. In the process of multi-partition backlight driving, due to the lack of effective overvoltage protection measures, under the abnormal conditions of poor plugging and unstable power supply voltage, the driving voltage of the backlight module is easy to continuously rise, and great potential safety hazards exist.

Disclosure of Invention

The embodiment of the application provides a display device and a protection method thereof, which can effectively protect a backlight module of the display device under abnormal conditions such as poor plugging and unstable power supply voltage.

In a first aspect, an embodiment of the present application provides a display device, which includes a processor, a PWM driver, a DC/DC converter, and multiple backlights; the PWM driver is connected with each path of backlight source, the processor is respectively connected with the PWM driver and the DC/DC converter, and the DC/DC converter is connected with each path of backlight source and used for providing driving voltage for each path of backlight source;

the PWM driver is configured to:

driving the backlight sources by preset constant current values, and feeding back driving voltage values required by the backlight sources to the processor;

the processor is configured to:

adjusting the output voltage value of the DC/DC converter to a target driving voltage value according to the driving voltage value required by each path of backlight source fed back by the PWM driver, wherein the target driving voltage value is the maximum driving voltage value in the driving voltage values required by each path of backlight source;

and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the working current of each path of backlight source is smaller than the preset constant current value, starting a preset protection measure.

In one possible implementation, the processor is further configured to:

and determining the target driving voltage value according to the driving voltage value required by each path of backlight source fed back by the PWM driver, and sending a first voltage control signal to the DC/DC converter, wherein the first voltage control signal is used for adjusting the output voltage value of the DC/DC converter to the target driving voltage value.

In one possible implementation, the processor is further configured to:

when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the number of the backlight sources with working currents smaller than the preset constant current value is smaller than the total number of the backlight sources configured for the display device, sending a second voltage control signal to the DC/DC converter, where the second voltage control signal is used to control the output voltage value of the DC/DC converter to keep the target driving voltage value unchanged.

In one possible implementation, the processor is specifically configured to:

and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the working current of each path of backlight source is smaller than the preset constant current value, reducing the backlight power of each path of backlight source, or closing each path of backlight source.

In a possible implementation, the display device further includes a communication component, the communication component is connected to the processor, and the processor is further configured to:

and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the working current of each backlight source is smaller than the preset constant current value, sending fault reminding information to external associated equipment based on the communication assembly.

In a possible embodiment, the display device further comprises a feedback circuit, and the processor is connected with the DC/DC converter through the feedback circuit;

the feedback circuit is used for receiving the voltage control signal sent by the processor and sending the voltage control signal to the DC/DC converter.

In a second aspect, an embodiment of the present application provides a protection method for a display device, including:

driving each path of backlight source of the display equipment by using a preset constant current value, and detecting a driving voltage value required by each path of backlight source;

adjusting the driving voltage of each backlight source to a target driving voltage value according to the driving voltage value required by each backlight source, wherein the target driving voltage value is the maximum driving voltage value in the driving voltage values required by each backlight source;

In a possible embodiment, the method further comprises:

and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the number of the backlight sources with the working currents smaller than the preset constant current value is smaller than the total number of the backlight sources configured for the display device, keeping the target driving voltage value unchanged.

In a possible embodiment, the initiating of the predetermined protective measure includes:

and reducing the backlight power of each path of backlight source, or closing each path of backlight source.

and sending fault reminding information to external associated equipment.

According to the display device and the protection method thereof, when the driving voltage value of each backlight source of the display device reaches the preset maximum driving voltage value, if the working current of each backlight source is smaller than the preset constant current value, the potential safety hazard of the backlight module can be determined, and at the moment, the backlight module can be prevented from being damaged due to abnormal conditions such as poor plugging and unstable power supply voltage by starting the preset protection measures. That is, in the embodiment of the present application, when the driving voltage of the backlight module is increased due to an abnormal condition of the display device and reaches the preset maximum driving voltage value, if each of the backlight sources cannot normally operate, the backlight module can be effectively protected in time by starting the preset protection measure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present application or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive exercise.

Fig. 1 is a block diagram schematically showing a hardware configuration of a display device 200 according to an exemplary embodiment;

fig. 2 is a first schematic hardware structure diagram of a display device provided in an embodiment of the present application;

fig. 3 is a schematic diagram of a hardware structure of a display device provided in an embodiment of the present application;

fig. 4 is a schematic flowchart of a protection method for a display device provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but 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 addition, while the disclosure herein has been presented in terms of one or more exemplary examples, it should be appreciated that aspects of the disclosure may be implemented solely as a complete embodiment.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

The terms "first," "second," 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 such that the embodiments described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises" and "comprising," and 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 those elements explicitly listed, but may include other elements not expressly listed or inherent to such product or device.

A hardware configuration block diagram of a display device 200 according to an exemplary embodiment is exemplarily shown in fig. 1.

In some embodiments, the display device 200 may be controlled using mobile terminals, tablets, computers, laptops, and other smart devices. For example, the display device 200 is controlled using an application program running on the smart device. The application, through configuration, may provide the user with various controls in an intuitive User Interface (UI) on a screen associated with the smart device.

In some embodiments, the mobile terminal may install a software application with the display device 200 to implement connection communication through a network communication protocol for the purpose of one-to-one control operation and data communication.

The display apparatus 200 also performs data communication with a server through various communication means. 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 may provide various contents and interactions to the display apparatus 200.

The display device 200 may be an LED display, an OLED display, or the like. The particular display device type, size, resolution, etc. are not limiting, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.

The display apparatus 200 may additionally provide an intelligent network tv function of a computer support function including, but not limited to, a network tv, an intelligent tv, an Internet Protocol Tv (IPTV), and the like, in addition to the broadcast receiving tv function.

In some embodiments, at least one of the controller 250, the tuner demodulator 210, the communicator 220, the detector 230, the input/output interface 255, the display 275, the audio output interface 285, the memory 260, the power supply 290, the user interface 265, and the external device interface 240 is included in the display apparatus 200.

In some embodiments, a display screen 275 receives image signals originating from the first processor output and displays video content and images and components of the menu manipulation interface.

In some embodiments, the display 275, includes a display component for presenting a picture, and a driving component for driving the display of an image.

In some embodiments, the video content is displayed from broadcast television content, or alternatively, from various broadcast signals that may be received via wired or wireless communication protocols. Alternatively, various image contents received from the network communication protocol and sent from the network server side can be displayed.

In some embodiments, the display screen 275 is used to present a user-manipulated UI interface generated in the display device 200 and used to control the display device 200.

In some embodiments, a drive assembly for driving the display is also included, depending on the type of display screen 275.

In some embodiments, the display screen 275 is a projection display screen and may also include a projection device and a projection screen.

In some embodiments, communicator 220 is a component for communicating with external devices or external servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi chip, a bluetooth communication protocol chip, a wired ethernet communication protocol chip, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver.

In some embodiments, the display apparatus 200 may establish control signal and data signal transmission and reception with an external control apparatus or a content providing apparatus through the communicator 220.

In some embodiments, user interface 265 may be configured to receive infrared control signals from a control device (e.g., an infrared remote control, etc.).

In some embodiments, the detector 230 is a signal used by the display device 200 to collect an external environment or interact with the outside.

In some embodiments, the detector 230 includes a light receiver, a sensor for collecting the intensity of ambient light, and parameters changes can be adaptively displayed by collecting the ambient light, and the like.

In some embodiments, the detector 230 may further include an image collector, such as a camera, etc., which may be configured to collect external environment scenes, collect attributes of the user or gestures interacted with the user, adaptively change display parameters, and recognize user gestures, so as to implement a function of interaction with the user.

In some embodiments, the detector 230 may also include a temperature sensor or the like, such as by sensing ambient temperature.

In some embodiments, the display apparatus 200 may adaptively adjust a display color temperature of an image. For example, the display apparatus 200 may be adjusted to display a cool tone when the temperature is in a high environment, or the display apparatus 200 may be adjusted to display a warm tone when the temperature is in a low environment.

In some embodiments, the detector 230 may also include a sound collector or the like, such as a microphone, which may be used to receive the user's voice. Illustratively, a voice signal including a control instruction of the user to control the display device 200, or to collect an ambient sound for recognizing an ambient scene type, so that the display device 200 can adaptively adapt to an ambient noise.

In some embodiments, as shown in fig. 1, the input/output interface 255 is configured to allow data transfer between the controller 250 and external other devices or other controllers 250. Such as receiving video signal data and audio signal data of an external device, or command instruction data, etc.

In some embodiments, the external device interface 240 may include, but is not limited to, the following: the interface can be any one or more of a high-definition multimedia interface (HDMI), an analog or data high-definition component input interface, a composite video input interface, a USB input interface, an RGB port and the like. The plurality of interfaces may form a composite input/output interface.

In some embodiments, as shown in fig. 1, the tuning demodulator 210 is configured to receive a broadcast television signal through a wired or wireless receiving manner, perform modulation and demodulation processing such as amplification, mixing, resonance, and the like, and demodulate an audio and video signal from a plurality of wireless or wired broadcast television signals, where the audio and video signal may include a television audio and video signal carried in a television channel frequency selected by a user and an EPG data signal.

In some embodiments, the frequency points demodulated by the tuner demodulator 210 are controlled by the controller 250, and the controller 250 can send out control signals according to user selection, so that the modem responds to the television signal frequency selected by the user and modulates and demodulates the television signal carried by the frequency.

In some embodiments, the broadcast television signal may be classified into a terrestrial broadcast signal, a cable broadcast signal, a satellite broadcast signal, an internet broadcast signal, or the like according to the broadcasting system of the television signal. Or may be classified into a digital modulation signal, an analog modulation signal, and the like according to a modulation type. Or the signals are classified into digital signals, analog signals and the like according to the types of the signals.

In some embodiments, 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. Therefore, the set top box outputs the television audio and video signals modulated and demodulated by the received broadcast television signals to the main body equipment, and the main body equipment receives the audio and video signals through the first input/output interface.

In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 may control 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 275, the controller 250 may perform an operation related to the object selected by the user command.

As shown in fig. 1, the controller 250 includes at least one of a Random Access Memory 251 (RAM), a Read-Only Memory 252 (ROM), a video processor 270, an audio processor 280, other processors 253 (e.g., a Graphics Processing Unit (GPU), a Central Processing Unit 254 (CPU), a Communication Interface (Communication Interface), and a Communication Bus 256(Bus), which connects the respective components.

In some embodiments, RAM 251 is used to store temporary data for the operating system or other programs that are running

In some embodiments, ROM 252 is used to store instructions for various system boots.

In some embodiments, the ROM 252 is used to store a Basic Input Output System (BIOS). The system is used for completing power-on self-test of the system, initialization of each functional module in the system, a driver of basic input/output of the system and booting an operating system.

In some embodiments, when the power-on signal is received, the display device 200 starts to power up, the CPU executes the system boot instruction in the ROM 252, and copies the temporary data of the operating system stored in the memory to the RAM 251 so as to start or run the operating system. After the start of the operating system is completed, the CPU copies the temporary data of the various application programs in the memory to the RAM 251, and then, the various application programs are started or run.

In some embodiments, CPU processor 254 is used to execute operating system and application program instructions stored in memory. And executing various application programs, data and contents according to various interactive instructions received from the outside so as to finally display and play various audio and video contents.

In some example embodiments, the CPU processor 254 may comprise a plurality of processors. The plurality of processors may include a main processor and one or more sub-processors. A main processor for performing some operations of the display apparatus 200 in a pre-power-up mode and/or operations of displaying a screen in a normal mode. One or more sub-processors for one operation in a standby mode or the like.

In some embodiments, the graphics processor 253 is used to generate various graphics objects, such as: icons, operation menus, user input instruction display graphics, and the like. The display device comprises an arithmetic unit which carries out operation by receiving various interactive instructions input by a user and displays various objects according to display attributes. And the rendering device is used for rendering various objects obtained based on the arithmetic unit, and the rendered objects are used for being displayed on a display screen.

In some embodiments, the video processor 270 is configured to receive an external video signal, and perform video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, image synthesis, and the like according to a standard codec protocol of the input signal, so as to obtain a signal that can be displayed or played on the direct display device 200.

In some embodiments, video processor 270 includes a demultiplexing module, a video decoding module, an image compositing 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 if the input MPEG-2 is input, the demultiplexing module demultiplexes the input audio and video data stream into a video signal and an audio signal.

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.

The frame rate conversion module is configured to convert an input video frame rate, such as a 60Hz frame rate into a 120Hz frame rate or a 240Hz frame rate, and the normal format is implemented in, for example, an interpolation frame mode.

The display format module is used for converting the received video output signal after the frame rate conversion, and changing the signal to conform to the signal of the display format, such as outputting an RGB data signal.

In some embodiments, the graphics processor 253 may be integrated with the video processor, or may be separately configured, where the graphics processor may perform processing on a graphics signal output to the display screen during the integrated configuration, and may perform different functions respectively during the separate configuration, for example, a GPU + frc (frame Rate conversion) architecture.

In some embodiments, the audio processor 280 is configured to receive an external audio signal, decompress and decode the received audio signal according to a standard codec protocol of the input signal, and perform noise reduction, digital-to-analog conversion, and amplification processes to obtain an audio signal that can be played in a speaker.

In some embodiments, video processor 270 may comprise one or more chips. The audio processor may also comprise one or more chips.

In some embodiments, the video processor 270 and the audio processor 280 may be separate chips or may be integrated together with the controller in one or more chips.

The power supply 290 supplies power to the display device 200 from the power input from the external power source under the control of the controller 250. The power supply 290 may include a built-in power supply circuit installed inside the display apparatus 200, or may be a power supply interface installed outside the display apparatus 200 to provide an external power supply in the display apparatus 200.

A user interface 265 for receiving an input signal of a user and then transmitting the received user input signal to the controller 250. The user input signal may be a remote controller signal received through an infrared receiver, and various user control signals may be received through the network communication module.

In some embodiments, the user inputs a user command through the control device or the mobile terminal, the user input interface responds to the user input through the controller 250 according to the user input, and the display apparatus 200 responds to the user input through the controller 250.

In some embodiments, a user may enter user commands on a Graphical User Interface (GUI) displayed on the display 275, and the user input interface receives the user input commands 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, 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 form that is acceptable to the user. 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 a visual interface element such as an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc.

The memory 260 includes a memory storing various software modules for driving the display device 200. Such as: various software modules stored in the first memory, including: at least one of a basic module, a detection module, a communication module, a display control module, a browser module, and various service modules.

The base module is a bottom layer software module for signal communication between various hardware in the display device 200 and for sending processing and control signals to the upper layer module. The detection module is used for collecting various information from various sensors or user input interfaces, and the management module is used for performing digital-to-analog conversion and analysis management. The display control module is used for controlling the display to display the image content, and can be used for playing the multimedia image content, the UI interface and other information. And the communication module is used for carrying out control and data communication with external equipment. And the browser module is used for executing a module for data communication between browsing servers. And the service module is used for providing various services and modules including various application programs. Meanwhile, the memory 260 may store a visual effect map for receiving external data and user data, images of various items in various user interfaces, and a focus object, etc.

The backlight module of the conventional display device is composed of multiple backlight sources, and the multiple backlight sources are usually driven by a common anode to form multiple backlight partitions. In the process of multi-partition backlight driving, due to the lack of effective overvoltage protection measures, under the abnormal conditions of poor plugging and unstable power supply voltage, the voltage of the backlight module is easily increased continuously, and great potential safety hazards exist.

In order to solve the above technical problem, an embodiment of the present application provides a display device, where when a driving voltage value of each backlight source of the display device reaches a preset maximum driving voltage value, if a working current of each backlight source is smaller than a preset constant current value, it can be determined that a potential safety hazard exists in a backlight module at present, and at this time, by starting a preset protection measure, it is able to avoid in time that the backlight module is damaged due to abnormal conditions such as poor plugging and unstable power supply voltage.

The following examples are given for illustrative purposes.

Referring to fig. 2, fig. 2 is a first schematic diagram of a hardware configuration structure of a display device provided in an embodiment of the present application, where the display device includes a processor 254, a PWM driver 101, a DC/DC converter 102, and a multi-channel backlight 103.

The PWM driver 101 is connected to each backlight 103, the processor 254 is connected to the PWM driver 101 and the DC/DC converter 102, and the DC/DC converter 102 is connected to each backlight 103 and configured to provide a driving voltage for each backlight 103.

Each path of backlight source 103 includes a plurality of LED strings, and each path of backlight source 103 adopts the same driving electrode, and the output voltage of the driving electrode is controlled by the DC/DC converter 102.

The PWM driver 101 may provide an adjustable current signal to drive the LED lamps in each backlight 103.

The PWM driver can utilize the digital output of the microprocessor to control the analog circuit, and the control mode is to control the on-off of the switching element of the inverter circuit to make the output end obtain a series of pulses with equal amplitude, and the pulses are used to replace sine waves or required waveforms. That is, a plurality of pulses are generated in a half cycle of an output waveform, so that the equivalent voltage of each pulse is a sine waveform, and the obtained output is smooth and has few low-order harmonics. PWM drivers typically operate at a fixed frequency and by providing digital pulses of different widths, varying the output current and thus adjusting the brightness of the LED can be achieved simply.

In some embodiments, the signal from the PWM driver is not directly used to control the LED, but rather controls a switch, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), to provide the desired drive current to the LED.

The DC/DC converter is a voltage converter which effectively outputs a fixed voltage after converting an input voltage. They can be generally classified into three categories: a step-up DC/DC converter, a step-down DC/DC converter, and a step-up/step-down DC/DC converter.

In the embodiment of the present application, the PWM driver 101 is configured to drive each backlight 103 with a preset constant current value, and feed back a driving voltage value required by each backlight 103 to the processor 254.

The PWM driver 101 drives each backlight 103, so that the working current of each backlight 103 is more stable and accurate, and the color difference of the LEDs during light emission is reduced to the maximum. The driving voltage value required for each backlight 103 can be understood as a voltage value at which each backlight 103 can be operated at the above-described preset constant current value.

The processor 254 is configured to determine a target driving voltage value according to the driving voltage value required by each backlight 103 fed back by the PWM driver 101, and adjust the output voltage value of the DC/DC converter 102 to the target driving voltage value, where the target driving voltage value is a maximum driving voltage value among the driving voltage values required by each backlight 103.

It should be noted that, in some embodiments, the DC/DC converter 102 sets a voltage range capable of satisfying the constant current output according to the hardware configuration information of the display device, and a maximum value of the voltage range is the preset voltage threshold.

After the display device is powered on, the processor 254 performs initialization settings for the PWM controller 101 and the DC/DC converter 102, including channel enable settings, drive current settings, and other necessary settings in the PWM controller 101, to enable each backlight 103 to operate at a constant drive current.

After the output voltage of the DC/DC converter 102 is stabilized, the processor 254 receives the driving voltage value required by each backlight 103 fed back by the PWM driver 101 in real time, and adjusts the output voltage of the DC/DC converter 102 in real time according to the received driving voltage value required by each backlight 103, so that the output voltage of the DC/DC converter 102 is the target driving voltage value.

The target driving voltage value is the maximum driving voltage value among the driving voltage values required by the backlight sources, so that the working current of each backlight source 103 can be ensured to be the constant current value.

It can be understood that, since each of the backlights 103 is usually provided with a voltage divider circuit, when the output voltage of the DC/DC converter 102 is adjusted to the target driving voltage value, the voltage divider circuit of each of the backlights adjusts the operating voltage of each of the backlights to the rated driving voltage by voltage division, so that the driving current of each of the backlights becomes the constant current value.

In the operation process of the display device, if the display device is in an abnormal condition, and the voltage of one or more of the backlights 103 is shared by the wires, so that the working current of the one or more of the backlights 103 is smaller than the constant current value, the display device will increase the output voltage of the DC/DC converter 102, increase the driving voltage of the one or more of the backlights 103, and increase the working current of the one or more of the backlights 103 to the constant current value.

In the present application, after the output voltage of the DC/DC converter 102 is increased to the voltage threshold preset by the DC/DC converter 102, all the backlights 103 are continuously monitored, and if the working currents of all the backlights 103 cannot reach the constant current value, it can be determined that the backlight module currently has a potential safety hazard.

That is, in the embodiment of the present application, when the target driving voltage value is greater than or equal to the preset voltage threshold, if the working current of each of the backlight sources 103 is smaller than the preset constant current value, it is determined that the backlight module currently has a potential safety hazard, and a preset protection measure needs to be started to protect the backlight module.

It can be understood that, because under some abnormal conditions such as poor plug-in and unstable power supply voltage, the driving voltage of the backlight module of the display device is easy to rise, thereby causing the backlight module to be easily damaged, and having great potential safety hazard, when the driving voltage value of each backlight source of the display device reaches the preset maximum driving voltage value, if the working current of each backlight source is smaller than the preset constant current value, the current potential safety hazard of the backlight module can be determined, at the moment, by starting the preset protection measure, the damage of the backlight module caused by the abnormal conditions such as poor plug-in and unstable power supply voltage can be timely avoided, and the backlight module is effectively protected.

In another possible implementation, after receiving the driving voltage values required by the backlight sources 103 fed back by the PWM driver 101, the processor 254 may further determine whether the driving voltage values required by the backlight sources 103 are all greater than the preset voltage threshold, and if the driving voltage values required by the backlight sources 103 are all greater than the preset voltage threshold, it may also be determined that the backlight module currently has a potential safety hazard and needs to start a preset protection measure.

Based on the content described in the foregoing embodiments, in the embodiment of the present application, the processor 254 is further configured to:

when the target driving voltage value is greater than or equal to the preset voltage threshold value, if the number of backlight sources with the working current less than the preset constant current value is less than the total number of backlight sources configured for the display device, a second voltage control signal is sent to the DC/DC converter 102, and the second voltage control signal is used for controlling the output voltage value of the DC/DC converter 102 to keep the target driving voltage value unchanged.

It can be understood that, after the output voltage of the DC/DC converter 102 is increased to the preset voltage threshold of the DC/DC converter 102, if only a part of the working current of the backlight source 103 cannot reach the preset constant current value through the voltage, and the other part of the working current of the backlight source 103 can reach the preset constant current value through the voltage value, it can be considered that there is no safety risk or the existing safety risk is small at present in the backlight module, and no protection measure needs to be started.

In other words, in the embodiment of the present application, when the driving voltage value of each of the backlight sources of the display device reaches the preset maximum driving voltage value, the preset protection measure needs to be started only when the working currents of all the backlight sources are smaller than the preset constant current value, so that the occurrence of erroneous judgment and unstable operation of the backlight module can be prevented.

Based on the description in the foregoing embodiments, in a possible implementation manner of the present application, the protection measures include reducing the backlight power of each backlight source 103, or turning off each backlight source 103.

That is, in the embodiment of the present application, when the target driving voltage value is greater than or equal to the preset voltage threshold, if the operating current of each of the backlight sources is smaller than the preset constant current value, the operating current of each of the backlight sources 103 may be increased to the preset constant current value by reducing the backlight power of each of the backlight sources 103, so that the display device can normally operate.

Or, after determining that the backlight module has potential safety hazard currently, directly closing each path of backlight source 103, and protecting the backlight module in time.

In another possible embodiment of the present application, the protection measures further include: and sending fault reminding information to the external associated equipment based on the communication component.

For example, after determining that the backlight module has a potential safety hazard currently, the processor 254 sends related fault reminding information to the main controller, and the main controller sends the relevant fault reminding information to the external associated device. And after the related personnel receive the fault reminding information sent by the display equipment through the external associated equipment, the fault reminding information is processed in time according to the fault reminding information, so that the potential safety hazard is eliminated.

Optionally, the external associated device includes, but is not limited to, a user device, a server, and a display device operation and maintenance platform.

Based on the content described in the foregoing embodiment, referring to fig. 3, fig. 3 is a schematic diagram of a hardware configuration structure of a display device provided in the embodiment of the present application. In another possible implementation manner of the present application, the display device further includes a feedback circuit 104.

The processor 254 is connected to the DC/DC converter 102 through the feedback circuit 104.

The processor 254 determines a target driving voltage value according to the driving voltage value required by each backlight 103 fed back by the PWM driver 101, and then feeds back the target driving voltage value to the feedback circuit 104, and the feedback circuit 104 sends a voltage control signal controlled by a program to the DC/DC converter 102 according to the target driving voltage value, so as to adjust the output voltage value of the DC/DC converter 102 to the target driving voltage value.

In one possible embodiment, the processor 254 determines a target driving voltage value according to the driving voltage value required by each backlight 103 fed back by the PWM driver 101, and feeds the target driving voltage value back to the feedback circuit 104, and the feedback circuit 104 sends a first voltage control signal for programmable control to the DC/DC converter 102 according to the target driving voltage value, where the first voltage control signal is used to adjust the output voltage value of the DC/DC converter 102 to the target driving voltage value.

In another possible embodiment, when the target driving voltage value is greater than or equal to the preset voltage threshold, the processor 254 determines the number of backlight sources with the operating current less than the preset constant current value, and sends a second voltage control signal to the DC/DC converter 102 through the feedback circuit 104 if the number of backlight sources with the operating current less than the preset constant current value is less than the total number of backlight sources configured for the display device, where the second voltage control signal is used for controlling the output voltage value of the DC/DC converter 102 to keep the target driving voltage value unchanged.

Based on the content described in the foregoing embodiment, an embodiment of the present application further provides a protection method for a display device, and referring to fig. 4, fig. 4 is a schematic flow diagram of the protection method for a display device provided in the embodiment of the present application, where the protection method for a display device includes:

s401, driving each path of backlight source of the display device by a preset constant current value, and detecting a driving voltage value required by each path of backlight source.

S402, adjusting the driving voltage of each backlight source to a target driving voltage value according to the driving voltage value required by each backlight source, wherein the target driving voltage value is the maximum driving voltage value in the driving voltage values required by each backlight source.

And S403, when the target driving voltage value is greater than or equal to the preset voltage threshold value, if the working current of each path of backlight source is smaller than a preset constant current value, starting a preset protection measure.

In a possible embodiment, after the driving voltage values required by the backlights are detected, if the driving voltage values required by the backlights are greater than or equal to the preset voltage threshold, the preset protection measure is started.

Based on the description in the above embodiments, in another possible implementation of the present application,

when the target driving voltage value is greater than or equal to the preset voltage threshold value, if the number of the backlight sources with the working current smaller than the preset constant current value is smaller than the total number of the backlight sources configured in the display device, the target driving voltage value is kept unchanged.

Based on the content described in the foregoing embodiments, in a possible implementation manner of the present application, the foregoing protection measures include: and reducing the backlight power of each backlight source, or closing each backlight source.

In another possible embodiment of the present application, the protection measures further include: and sending fault reminding information to external associated equipment.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules described above is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.

The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present application.

It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the methods disclosed in the incorporated application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.

The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.

The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.

The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, comprising a processor, a Pulse Width Modulation (PWM) driver, a DC/DC converter, and a multi-channel backlight; the PWM driver is connected with each path of backlight source, the processor is respectively connected with the PWM driver and the DC/DC converter, and the DC/DC converter is connected with each path of backlight source and is used for providing driving voltage for each path of backlight source;

the PWM driver is configured to:

the processor is configured to:

when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the working current of each path of backlight source is smaller than the preset constant current value, reducing the backlight power of each path of backlight source, or closing each path of backlight source; the preset voltage threshold is a maximum voltage value which is set by the DC/DC converter according to the hardware configuration information of the display equipment and can meet the constant current output voltage range.

2. The display device of claim 1, wherein the processor is configured to:

3. The display device of claim 2, wherein the processor is further configured to:

4. The display device of claim 1, further comprising a communication component coupled to the processor, the processor further configured to:

5. The display device according to any one of claims 1 to 4, wherein the display device further comprises a feedback circuit, and the processor is connected with the DC/DC converter through the feedback circuit;

6. A method of protecting a display device, comprising:

7. The method of claim 6, further comprising:

and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the number of the backlight sources with working currents smaller than the preset constant current value is smaller than the total number of the backlight sources configured for the display device, keeping the target driving voltage value unchanged.

8. The method of claim 6, further comprising: and when the target driving voltage value is greater than or equal to a preset voltage threshold value, if the working current of each path of backlight source is smaller than the preset constant current value, sending fault reminding information to external associated equipment.