A control circuit, device, and vehicle for an in-vehicle display device

Abstract

This application provides a control circuit, device, and vehicle for an in-vehicle display device, including a controller, a backlight driver module, a display module, and a hardware shutdown module. The controller outputs a brightness control signal; the backlight driver module is electrically connected to the controller, receives the brightness control signal output by the controller, and outputs a power supply signal corresponding to the brightness control signal; the display module is electrically connected to the backlight driver module, receives the power supply signal output by the backlight driver module, and displays the corresponding brightness; the hardware shutdown module is electrically connected to the backlight driver module, outputs a first enable control signal to the backlight driver module, which controls the backlight driver module to stop outputting the power supply signal, thereby turning off the display module. The backlight driver module can be independently shut down, avoiding the problem of the display module not being able to be turned off in the event of a software failure in the controller.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a control circuit, device, and vehicle for an in-vehicle display device. Background Technology

[0002] In-vehicle displays are core components of the cockpit's human-machine interface, and their backlight brightness directly affects the visual experience and driving safety of passengers. Abnormal backlight brightness is a common fault in in-vehicle displays, including brightness deviation and fluctuations. When the backlight brightness of an in-vehicle display is abnormal, it not only reduces the display effect but also accelerates the aging of the display modules (e.g., LED displays). In severe cases, it can cause the backlight driver module and the display module to burn out, leading to damage to the in-vehicle display and, in extreme cases, even causing a fire inside the vehicle.

[0003] Currently, automotive display devices primarily rely on software for backlight brightness anomaly detection and protection. Specifically, a backlight photoelectric signal sampling module samples the backlight voltage and / or backlight current of the display module to obtain backlight voltage and / or backlight current signals. The controller then determines whether an abnormal backlight brightness exists based on these signals. If an abnormal backlight brightness is detected, the backlight driver module is shut down, preventing it from supplying power to the display module and ultimately turning off the display module.

[0004] However, in practical applications, the controller's software may malfunction (e.g., the controller crashes), potentially preventing the controller from shutting down the display module. Understandably, if the display module cannot be shut down promptly when the backlight brightness of the in-vehicle display is abnormal, it could damage the in-vehicle display device.

[0005] It should be noted that the information disclosed in the background section of this application is intended only to enhance the understanding of the general background of this application, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] This application provides a control circuit for an in-vehicle display device, an in-vehicle display device, and a vehicle, in order to solve the problem in the prior art where, when the backlight brightness of the in-vehicle display device is abnormal, the display module cannot be turned off due to a software fault in the controller.

[0007] In a first aspect, embodiments of this application provide a control circuit for an in-vehicle display device, including: The controller is used to output brightness control signals; A backlight driving module is electrically connected to the controller. The backlight driving module is used to receive the brightness control signal output by the controller and output a power supply signal corresponding to the brightness control signal according to the brightness control signal. The display module is electrically connected to the backlight driving module. The display module is used to receive the power supply signal output by the backlight driving module and display the corresponding brightness. A hardware shutdown module is electrically connected to the backlight driver module. The hardware shutdown module is used to output a first enable control signal to the backlight driver module. The first enable control signal is used to control the backlight driver module to stop outputting the power supply signal.

[0008] In this embodiment, a hardware shutdown module is provided in the control circuit of the vehicle display device. The hardware shutdown module does not depend on the controller and can independently control the shutdown of the backlight drive module, thereby shutting down the display module. This avoids the problem that the display module cannot be shut down when there is a software failure in the controller.

[0009] In addition, since the hardware shutdown module directly triggers the shutdown action of the backlight driver module through hardware logic, there is no software-level delay, the response speed is faster, and the interference of excessive backlight to drivers and passengers can be minimized, thus ensuring driving safety.

[0010] One possible implementation also includes: The detection module is electrically connected to the hardware shutdown module, and the detection module is used to output a first detection signal when the brightness of the display module is detected to be abnormal; The hardware shutdown module is specifically used to output a first enable control signal to the backlight driving module when it receives the first detection signal output by the detection module.

[0011] In this embodiment, a detection module is added to detect the working status of the display module in real time, which can promptly identify abnormal brightness of the display module and automatically trigger the hardware shutdown module to shut down the backlight driver module.

[0012] In one possible implementation, the detection module includes: A sampling module is electrically connected to the node between the backlight driving module and the display module. The sampling module is used to sample the power supply signal output by the backlight driving module and output a sampling signal. The comparison module is electrically connected to the sampling module. The comparison module is used to output a first enable control signal to the backlight driving module when the comparison result between the sampled signal and the reference signal meets the preset conditions.

[0013] In this embodiment, the detection module uses hardware to detect the working status of the display module, so that the detection module and the hardware shutdown module form a hardware detection and shutdown link, which has no software-level delay, higher reliability, and faster response speed.

[0014] In one possible implementation, the detection module further includes: An adjustment module is electrically connected to the comparison module, and the adjustment module is used to adjust the magnitude of the reference signal.

[0015] In this embodiment, an adjustment module is added, which can flexibly adjust the size of the reference signal of the comparison module, thereby realizing the configurable design of the reference signal and having stronger scene adaptability and versatility.

[0016] In one possible implementation, the sampling module is specifically used to sample the voltage and / or current in the power supply signal output by the backlight driving module, and output the sampled voltage and / or sampled current. The comparison module is specifically used to output a first enable control signal to the backlight driving module when the comparison result between the sampled voltage and the reference voltage meets a preset voltage condition, and / or the comparison result between the sampled current and the reference current meets a preset current condition.

[0017] In this embodiment, the operating status of the display module is detected based on the voltage and / or current of the power supply signal. Since the voltage and / or current of the power supply signal can more directly and accurately reflect whether the backlight brightness is abnormal, using the voltage and / or current of the power supply signal as the sampling object can make the detection result of the operating status of the display module more accurate.

[0018] In one possible implementation, the comparison module is further configured to: When the comparison result between the sampled signal and the reference signal does not meet the preset conditions, a second enable control signal is output to the backlight driving module. The second enable control signal is used to control the backlight driving module to start outputting the power supply signal.

[0019] In this embodiment, in addition to outputting a first enable control signal to control the backlight driving module to turn off when the comparison result between the sampled signal and the reference signal meets the preset conditions, the comparison module can also output a second enable control signal to control the backlight driving module to turn on when the comparison result between the sampled signal and the reference signal does not meet the preset conditions. This allows the backlight driving module to automatically start outputting a power supply signal after the backlight brightness fault is resolved, thus achieving automatic startup after the fault is cleared and improving the user experience.

[0020] In one possible implementation, the detection module is further configured to output a second detection signal when the brightness of the display module is detected to be normal; The hardware shutdown module is further configured to output a second enable control signal to the backlight driving module when it receives the second detection signal output by the detection module. The second enable control signal is used to control the backlight driving module to start outputting the power supply signal.

[0021] In this embodiment, in addition to outputting a first detection signal when the display module detects abnormal brightness, the detection module can also output a second detection signal when the display module detects normal brightness. After receiving the second detection signal, the hardware shutdown module outputs a second enable control signal to control the backlight driver module to start outputting a power supply signal. This achieves automatic startup after the fault is cleared, improving the user experience.

[0022] In one possible implementation, the controller is specifically used for: Determine the target brightness value based on the ambient light signal and / or brightness adjustment command; Based on the target brightness value, output a brightness control signal corresponding to the target brightness value.

[0023] In this embodiment, the controller can adjust the brightness of the display module according to the ambient light signal and / or brightness adjustment command to improve the user experience.

[0024] Secondly, embodiments of this application also provide an in-vehicle display device, including: The control circuit described in any one of the first aspects.

[0025] Thirdly, embodiments of this application also provide a vehicle, including: The vehicle-mounted display device described in the second aspect. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the control circuit of an in-vehicle display device in related technologies.

[0029] Figure 3This is a schematic diagram of the control circuit of an in-vehicle display device provided in an embodiment of this application.

[0030] Figure 4 A schematic diagram of the control circuit of another vehicle-mounted display device provided in an embodiment of this application.

[0031] Figure 5 A schematic diagram of the control circuit of another vehicle-mounted display device provided in an embodiment of this application.

[0032] Figure 6 A schematic diagram of the control circuit of another vehicle-mounted display device provided in an embodiment of this application.

[0033] Figure 7 A schematic diagram of the control circuit of another vehicle-mounted display device provided in an embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the structure of an in-vehicle display device provided in an embodiment of this application. Detailed Implementation

[0035] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0037] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] See Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of this application. For example... Figure 1 As shown, the vehicle 100 includes an in-vehicle display device 101, which is the core component of the cockpit human-machine interaction and is mainly used to display navigation, vehicle information, entertainment content and realize human-machine interaction.

[0040] In this embodiment, the in-vehicle display device 101 can be an in-vehicle instrument panel, a central control screen, a passenger / rear seat entertainment screen, etc. This embodiment does not specifically limit the type of in-vehicle display device 101. Furthermore, the vehicle 100 can specifically be a car, a motorcycle, etc., and this embodiment does not specifically limit the type of vehicle 100.

[0041] Backlight brightness is a core indicator of display and safety performance in automotive display devices, directly impacting the visual experience and driving safety of passengers. Abnormal backlight brightness is a common malfunction in automotive display devices, including brightness deviation and fluctuations. When the backlight brightness of an automotive display device is abnormal, it not only reduces the display effect but also accelerates the aging of the display modules (e.g., LED displays). In severe cases, it can cause the backlight driver module and display module to burn out, leading to damage to the automotive display device and, in extreme cases, even causing a vehicle fire.

[0042] See Figure 2 This is a schematic diagram of the control circuit for an in-vehicle display device in related technologies. For example... Figure 2 As shown, the control circuit of the vehicle-mounted display device includes a controller, a backlight driver module, and a display module. The controller outputs a brightness control signal; the backlight driver module is electrically connected to the controller, receives the brightness control signal output by the controller, and outputs a power supply signal corresponding to the brightness control signal; the display module is electrically connected to the backlight driver module, receives the power supply signal output by the backlight driver module, and displays the corresponding brightness.

[0043] In addition, Figure 2 The control circuit of the illustrated vehicle-mounted display device also includes a backlight photoelectric signal sampling module, which is electrically connected to both the display module and the controller. The backlight photoelectric signal sampling module samples the backlight voltage and / or backlight current of the display module to obtain backlight voltage and / or backlight current signals, and outputs these signals to the controller. The controller determines whether there is an abnormal backlight brightness based on the backlight voltage and / or backlight current signals; if an abnormal backlight brightness is found, the backlight drive module is shut down, causing it to stop outputting power signals to the display module, thereby turning off the display module. It is understood that in related technologies, vehicle-mounted display devices primarily rely on the controller to perform backlight brightness anomaly detection and protection through software.

[0044] However, in practical applications, the controller's software may malfunction (e.g., the controller crashes), potentially preventing the controller from shutting down the display module. Understandably, if the display module cannot be shut down promptly when the backlight brightness of the in-vehicle display is abnormal, it could damage the in-vehicle display device.

[0045] To address the aforementioned problems, this application provides a control circuit for an in-vehicle display device. A hardware shutdown module is incorporated into the control circuit, independent of the controller. This module can independently control the shutdown of the backlight driver module, thereby turning off the display module and avoiding the issue of the display module failing to shut down due to software malfunctions in the controller. Furthermore, since the hardware shutdown module directly triggers the shutdown action of the backlight driver module through hardware logic, there is no software-level delay, resulting in faster response and minimizing interference to drivers and passengers caused by excessive backlight brightness, thus ensuring driving safety. The technical solution provided by this application embodiment will be described in detail below with reference to the accompanying drawings.

[0046] See Figure 3 This is a schematic diagram of the control circuit for an in-vehicle display device provided in an embodiment of this application. Figure 3 As shown, the control circuit of the vehicle-mounted display device includes a controller, a backlight driver module, a display module, and a hardware shutdown module.

[0047] The system includes a controller for outputting a brightness control signal, a backlight driver module electrically connected to the controller for receiving the brightness control signal and outputting a power supply signal corresponding to the brightness control signal, a display module electrically connected to the backlight driver module for receiving the power supply signal and displaying the corresponding brightness, and a hardware shutdown module electrically connected to the backlight driver module for outputting a first enable control signal to the backlight driver module. The first enable control signal controls the backlight driver module to stop outputting the power supply signal (i.e., shut down the backlight driver module), thereby turning off the display module.

[0048] As can be understood, in this embodiment, the backlight driving module has two control links: one controls the backlight driving module through a controller; the other controls the backlight driving module through a hardware shutdown module. The two control links are relatively independent and do not affect each other. When the controller is functioning correctly, it can control the power supply signal to the backlight driving module, thereby controlling the brightness of the display module; when the controller malfunctions, the hardware shutdown module can shut down the backlight driving module, thereby turning off the display module.

[0049] In summary, in this embodiment, because a hardware shutdown module is included in the control circuit of the vehicle-mounted display device, the hardware shutdown module does not depend on the controller and can independently control the shutdown of the backlight driver module, thereby shutting down the display module. This avoids the problem of the display module not being able to be shut down when there is a software failure in the controller. Of course, when there is a hardware failure in the controller, the backlight driver module can also be shut down through the hardware shutdown module, which will not be elaborated further.

[0050] In addition, since the hardware shutdown module directly triggers the shutdown action of the backlight driver module through hardware logic, there is no software-level delay, the response speed is faster, and the interference of excessive backlight to drivers and passengers can be minimized, thus ensuring driving safety.

[0051] It should be noted that, in the embodiments of this application, since the controller typically needs to implement the corresponding control functions through software, and the hardware shutdown module is a pure hardware module (without software involvement), in some possible implementations, the control link of "controlling the backlight driving module through the controller" can also be called the "software control layer"; the control link of "controlling the backlight driving module through the hardware shutdown module" can also be called the "hardware control layer". The software control layer and the hardware control layer are independent of each other and do not depend on each other. The software control layer is mainly responsible for normal brightness control, while the hardware control layer is mainly responsible for fault hardware fallback protection. Even if the controller fails, the hardware control layer can still work reliably, improving the safety and reliability of the vehicle display device.

[0052] In one possible implementation, the hardware shutdown module is further configured to output a second enable control signal to the backlight driver module, which controls the backlight driver module to start outputting a power supply signal. In other words, in this embodiment, the hardware shutdown module can not only control the backlight driver module to turn off, but also control it to turn on.

[0053] Specifically, the hardware shutdown module can output a first enable control signal to control the backlight driver module to shut down when the display module brightness is abnormal; and output a second enable control signal to control the backlight driver module to turn on when the display module brightness is normal, so as to achieve automatic turn-on after the fault is eliminated and improve the user experience.

[0054] See Figure 4 This is a schematic diagram of the control circuit for another vehicle-mounted display device provided in an embodiment of this application. Figure 4 As shown, the control circuit of the vehicle-mounted display device is in Figure 3 Based on the illustrated embodiment, a detection module is also included. The detection module is electrically connected to the hardware shutdown module. The detection module outputs a first detection signal when it detects an abnormal brightness in the display module. Specifically, the hardware shutdown module outputs a first enable control signal to the backlight driver module upon receiving the first detection signal from the detection module, thereby shutting down the backlight driver module. It is understood that in this embodiment, the hardware control layer includes a detection module and a hardware shutdown module.

[0055] In this embodiment, a detection module is added to detect the working status of the display module in real time, which can promptly identify abnormal brightness of the display module and automatically trigger the hardware shutdown module to shut down the backlight driver module.

[0056] In one possible implementation, the detection module is further configured to output a second detection signal when the brightness of the display module is detected to be normal; the hardware shutdown module is further configured to output a second enable control signal to the backlight driver module when it receives the second detection signal output by the detection module, the second enable control signal being used to control the backlight driver module to start outputting a power supply signal.

[0057] In this embodiment, in addition to outputting a first detection signal when the display module detects abnormal brightness, the detection module can also output a second detection signal when the display module detects normal brightness. After receiving the second detection signal, the hardware shutdown module outputs a second enable control signal to control the backlight driver module to start outputting a power supply signal. This achieves automatic startup after the fault is cleared, improving the user experience.

[0058] It should be noted that other details regarding the embodiments of this application can be found in the description above, and will not be repeated here for the sake of brevity.

[0059] See Figure 5 This is a schematic diagram of the control circuit for another vehicle-mounted display device provided in an embodiment of this application. Figure 5 As shown, the control circuit of the vehicle-mounted display device is in Figure 4 Based on the illustrated embodiment, the detection module specifically includes a sampling module and a comparison module. The sampling module is electrically connected to the nodes between the backlight driving module and the display module. The sampling module is used to sample the power supply signal output by the backlight driving module and output a sampled signal. The comparison module is electrically connected to the sampling module. The comparison module is used to output a first enable control signal to the backlight driving module when the comparison result between the sampled signal and the reference signal meets a preset condition. It can be understood that in this embodiment, the hardware control layer includes a sampling module, a comparison module, and a hardware shutdown module.

[0060] It should be added that the node between the sampling module and the backlight driver module and the display module can be either the output terminal of the backlight driver module or the input terminal of the display module.

[0061] In this embodiment, the detection module uses hardware to detect the working status of the display module, so that the detection module and the hardware shutdown module form a hardware detection and shutdown link, which has no software-level delay, higher reliability, and faster response speed.

[0062] In one possible implementation, the sampling module is specifically used to sample the voltage and / or current in the power supply signal output by the backlight driving module, and output the sampled voltage and / or sampled current; the comparison module is specifically used to output a first enable control signal to the backlight driving module when the comparison result between the sampled voltage and the reference voltage meets a preset voltage condition, and / or the comparison result between the sampled current and the reference current meets a preset current condition.

[0063] In this embodiment, the sampling module specifically collects the voltage and current in the power supply signal. Overvoltage and overcurrent are direct indicators of abnormal backlight brightness. It is understood that voltage and current can more directly and accurately reflect abnormal backlight brightness. Therefore, by using voltage and current as sampling objects, the correspondence between the detection results and the actual fault state is clearer, and the detection results are more accurate.

[0064] It should be noted that those skilled in the art can also select other parameters as sampling objects and comparison objects according to actual needs, and the embodiments of this application do not impose specific limitations. In addition, other contents of the embodiments of this application can be found in the description above, and will not be repeated here for the sake of brevity.

[0065] In one possible implementation, the comparison module is further configured to: when the comparison result between the sampled signal and the reference signal does not meet the preset conditions, output a second enable control signal to the backlight driving module, the second enable control signal being used to control the backlight driving module to start outputting a power supply signal.

[0066] In this embodiment, in addition to outputting a first enable control signal to control the backlight driving module to turn off when the comparison result between the sampled signal and the reference signal meets the preset conditions, the comparison module can also output a second enable control signal to control the backlight driving module to turn on when the comparison result between the sampled signal and the reference signal does not meet the preset conditions. This allows the backlight driving module to automatically start outputting a power supply signal after the backlight brightness fault is resolved, thus achieving automatic startup after the fault is cleared and improving the user experience.

[0067] See Figure 6 This is a schematic diagram of the control circuit for another vehicle-mounted display device provided in an embodiment of this application. Figure 6 As shown, the control circuit of the vehicle-mounted display device is in Figure 5 Based on the illustrated embodiment, an adjustment module is also included. The adjustment module is electrically connected to the comparison module and is used to adjust the magnitude of the reference signal. It is understood that in this embodiment, the hardware control layer includes a sampling module, a comparison module, an adjustment module, and a hardware shutdown module.

[0068] In one possible implementation, when the reference signal is a reference voltage signal, the adjustment module is used to adjust the magnitude of the reference voltage signal; when the reference signal is a reference current signal, the adjustment module is used to adjust the magnitude of the reference current signal.

[0069] In this embodiment, an adjustment module is added, which allows for flexible adjustment of the reference signal magnitude of the comparison module, thus achieving a configurable design for the fault protection reference signal. Compared to traditional hardware protection circuits with fixed reference signals, this design offers stronger scenario adaptability and versatility.

[0070] It should be noted that other details regarding the embodiments of this application can be found in the description above, and will not be repeated here for the sake of brevity.

[0071] See Figure 7 This is another control circuit for an in-vehicle display device provided in an embodiment of this application. For example... Figure 7 As shown in the embodiment of this application, the controller can receive ambient light signals and brightness adjustment commands, and then determine the target brightness value based on the ambient light signals and / or brightness adjustment commands; and output a brightness control signal corresponding to the target brightness value based on the target brightness value.

[0072] In one possible implementation, the brightness adjustment command can be a user-triggered button operation or a brightness adjustment command automatically sent by other vehicle modules via the CAN bus. For example, the body control module detects that the headlights are on and sends a command to lower the screen brightness via the CAN bus. This application embodiment does not impose specific limitations on this.

[0073] In this embodiment, the controller can automatically adjust the brightness according to the ambient light signal, or adjust the brightness in response to the user's brightness adjustment command, so that the brightness of the display module can automatically adapt to changes in the environment. It also supports users to adjust as needed, meet the visual comfort requirements of different driving scenarios, and improve the user experience.

[0074] In one possible implementation, the controller can be implemented using an MCU, MPU, FPGA, or other integrated circuits with control functions, and this application does not impose specific limitations on this.

[0075] In one possible implementation, the controller may specifically be a cockpit master controller or a cockpit domain controller, etc., and this application embodiment does not impose specific limitations on this.

[0076] In one possible implementation, the controller outputs a brightness control signal that can be a PWM signal, an I2C signal, etc., and this application does not impose specific limitations on this.

[0077] In one possible implementation, the display module may use LED, CCFL or other types of light sources, and this application does not impose any specific restrictions on this.

[0078] Corresponding to the above embodiments, this application also provides an in-vehicle display device.

[0079] See Figure 8 This is a schematic diagram of the structure of an in-vehicle display device provided in an embodiment of this application. Figure 8 As shown, the vehicle-mounted display device 800 includes a control circuit 801.

[0080] Specifically, the vehicle display device 800 includes the control circuit of any of the vehicle display devices described in the above embodiments.

[0081] It should be noted that the specific details of the embodiments of this application can be found in the description above, and will not be repeated here for the sake of brevity.

[0082] Corresponding to the above embodiments, this application also provides a vehicle. The vehicle includes the in-vehicle display device described above.

[0083] It should be noted that other specific details regarding the embodiments of this application can be found in the description above, and will not be repeated here for the sake of brevity.

[0084] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0085] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0086] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A control circuit for an in-vehicle display device, characterized in that, include: The controller is used to output brightness control signals; A backlight driving module is electrically connected to the controller. The backlight driving module is used to receive the brightness control signal output by the controller and output a power supply signal corresponding to the brightness control signal according to the brightness control signal. The display module is electrically connected to the backlight driving module. The display module is used to receive the power supply signal output by the backlight driving module and display the corresponding brightness. A hardware shutdown module is electrically connected to the backlight driver module. The hardware shutdown module is used to output a first enable control signal to the backlight driver module. The first enable control signal is used to control the backlight driver module to stop outputting the power supply signal.

2. The control circuit according to claim 1, characterized in that, Also includes: The detection module is electrically connected to the hardware shutdown module, and the detection module is used to output a first detection signal when the brightness of the display module is detected to be abnormal; The hardware shutdown module is specifically used to output a first enable control signal to the backlight driving module when it receives the first detection signal output by the detection module.

3. The control circuit according to claim 2, characterized in that, The detection module includes: A sampling module is electrically connected to the node between the backlight driving module and the display module. The sampling module is used to sample the power supply signal output by the backlight driving module and output a sampling signal. The comparison module is electrically connected to the sampling module. The comparison module is used to output a first enable control signal to the backlight driving module when the comparison result between the sampled signal and the reference signal meets the preset conditions.

4. The control circuit according to claim 3, characterized in that, The detection module also includes: An adjustment module is electrically connected to the comparison module, and the adjustment module is used to adjust the magnitude of the reference signal.

5. The control circuit according to claim 3, characterized in that, The sampling module is specifically used to sample the voltage and / or current in the power supply signal output by the backlight driving module, and output the sampled voltage and / or sampled current. The comparison module is specifically used to output a first enable control signal to the backlight driving module when the comparison result between the sampled voltage and the reference voltage meets a preset voltage condition, and / or the comparison result between the sampled current and the reference current meets a preset current condition.

6. The control circuit according to claim 3, characterized in that, The comparison module is further configured to: When the comparison result between the sampled signal and the reference signal does not meet the preset conditions, a second enable control signal is output to the backlight driving module. The second enable control signal is used to control the backlight driving module to start outputting the power supply signal.

7. The control circuit according to claim 2, characterized in that, The detection module is also used to output a second detection signal when the brightness of the display module is detected to be normal. The hardware shutdown module is further configured to output a second enable control signal to the backlight driving module when it receives the second detection signal output by the detection module. The second enable control signal is used to control the backlight driving module to start outputting the power supply signal.

8. The control circuit according to claim 1, characterized in that, The controller is specifically used for: Determine the target brightness value based on the ambient light signal and / or brightness adjustment command; Based on the target brightness value, output a brightness control signal corresponding to the target brightness value.

9. A vehicle-mounted display device, characterized in that, include: The control circuit according to any one of claims 1-8.

10. A vehicle, characterized in that, include: The vehicle-mounted display device as described in claim 9.

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