Backlight adjustment device for a display screen, vehicle-mounted display and infotainment system

Abstract

This invention relates to a backlight adjustment device for a display screen, comprising at least one driver chip, an MCU, and a switching assembly. The MCU includes a first enable port and a second enable port corresponding to a first backlight mode and a second backlight mode, respectively. The controlled terminal of the switching assembly is connected to the first enable port and the second enable port. The MCU is configured to selectively control the on / off state of each switch in the switching assembly based on input commands from a user, to adjust the display screen to a specified backlight mode. This invention also relates to an in-vehicle display including the backlight adjustment device, and an infotainment system including the in-vehicle display.

Description

Technical Field

[0001] This invention relates to the field of electronic display technology, and more specifically, to a backlight adjustment device for a display screen, a vehicle display including the backlight adjustment device, and an infotainment system including the vehicle display. Background Technology

[0002] Electronic displays are widely used in products across various fields as a medium for conveying video information to users, including but not limited to vehicles, mobile phones, computers, and watches. In particular, most vehicles are currently equipped with in-vehicle displays, many of which are liquid crystal displays (LCDs). An LCD is a passive display, meaning it cannot emit light itself but requires a backlight coupled to the LCD (located on the back of the LCD) to illuminate the liquid crystal.

[0003] The backlight brightness of this type of backlight is typically adjusted using a PWM (Pulse Width Modulation) signal emitted by the MCU. For example, the backlight brightness is generally proportional to the duty cycle of this PWM signal. In particular, during vehicle operation, when the ambient light intensity changes, the MCU emits a PWM signal with a predetermined duty cycle to adjust the backlight brightness of the vehicle's display accordingly. However, in conventional backlight brightness adjustment, the duty cycle of the PWM signal is usually switched directly from the current value to the target value, which causes abrupt changes in the brightness of the vehicle's display.

[0004] Furthermore, the backlights in existing in-vehicle displays typically only support one lighting mode, thus lacking a strategy for switching between multiple lighting modes. A single lighting mode cannot meet the different display needs of users for in-vehicle displays. Summary of the Invention

[0005] To address the shortcomings of existing in-vehicle displays, such as the inability to switch between multiple lighting modes and the tendency for brightness abrupt changes, this invention proposes a display screen backlight adjustment device with switchable lighting modes. In addition to the conventional public mode, this device adds a private mode, allowing the display screen's backlight mode to be freely switched between the two modes. In public mode, users can see the content displayed on the screen from all angles, similar to the backlight mode of a conventional in-vehicle display. In private mode, only users at specific angles (e.g., the front passenger seat) can see the content displayed on the screen. This not only effectively protects the privacy of the displayed content but also prevents driver distraction caused by involuntary viewing of the screen content, thereby improving driving safety. Furthermore, by controlling the backlight brightness variation curve, phenomena such as abrupt changes in screen brightness and blackouts during mode switching and dimming can be avoided.

[0006] According to a first aspect of the invention, a backlight adjustment device for a display screen is provided, the device comprising at least one driver chip and an MCU, the at least one driver chip being configured to drive a backlight source disposed on the back of the display screen, the MCU being configured to adjust the backlight mode of the at least one driver chip according to input instructions from a user, advantageously,

[0007] The device also includes a switching assembly configured to form different current paths between the at least one driver chip and the backlight.

[0008] The backlight modes include a first backlight mode and a second backlight mode.

[0009] The MCU includes a first enable port and a second enable port corresponding to the first backlight mode and the second backlight mode, respectively.

[0010] The controlled terminal of the switching assembly is connected to the first enable port and the second enable port, so as to form different current paths between the at least one driver chip and the backlight according to the output signals provided by the first enable port and the second enable port.

[0011] The MCU is configured to selectively control the on / off state of each switch in the switching assembly based on input commands from the user, so as to adjust the display screen to a specified backlight mode.

[0012] Advantageously, the MCU is further configured to perform the following steps when it receives an input command to switch the display from a first backlight mode to a second backlight mode:

[0013] At the first moment, the output signal of the second enable port is set to a high level; and

[0014] At a second time after the first time, the output signal of the first enable port is set to a low level, wherein the second time is spaced from the first time by a predetermined duration.

[0015] Advantageously, the at least one driver chip includes a first driver chip and a second driver chip, and the switching assembly includes a first to a fourth switch, wherein,

[0016] The first switch is connected between the first driver chip and the first enable port;

[0017] The second switch is connected between the first driver chip and the second enable port;

[0018] The third switch is connected between the second driver chip and the first enable port; and

[0019] The fourth switch is connected between the second driver chip and the second enable port.

[0020] Advantageously, each of the first to fourth switches is turned on when a high-level signal is received and turned off when a low-level signal is received.

[0021] Advantageously, the switching assembly further includes a master switch configured to activate or deactivate the at least one driver chip under the control of the MCU.

[0022] Advantageously, the MCU further includes at least one brightness adjustment port connected to the at least one driver chip, and the MCU is further configured to perform the following steps when it receives an input instruction to adjust the display screen to a first backlight mode:

[0023] Turn on the main control switch to start the at least one driver chip;

[0024] Set the output signal of the first enable port to a high level; and

[0025] A corresponding brightness adjustment signal is output through the at least one brightness adjustment port to increase the backlight brightness of the at least one driver chip from the current value to the target value.

[0026] Advantageously,

[0027] The first backlight mode is a public backlight mode, and the second backlight mode is a privacy backlight mode.

[0028] Advantageously, the brightness adjustment signal output from the at least one brightness adjustment port is a PWM signal.

[0029] According to a second aspect of the present invention, an in-vehicle display is also provided, the in-vehicle display comprising:

[0030] Display screen;

[0031] A backlight source, wherein the backlight source is disposed on the back of the display screen to provide corresponding backlight illumination to the display screen; and

[0032] The backlight adjustment device described above is used to adjust the illumination of the backlight source.

[0033] According to a third aspect of the present invention, an in-vehicle infotainment system is also provided, comprising:

[0034] The in-vehicle display as described above; and

[0035] The vehicle-mounted host is used to provide the video signal to be displayed to the vehicle-mounted display.

[0036] The advantages of the backlight adjustment device for a display screen according to the present invention compared to conventional backlight adjustment devices include:

[0037] - It provides two backlighting modes and allows for free switching between different backlighting modes, thus ensuring that a suitable lighting mode can be provided for different user needs;

[0038] - In private mode, only users in specific positions (e.g., the front passenger seat) can see the content displayed on the screen. This not only effectively protects the privacy of the displayed content but also prevents driver distraction caused by involuntary viewing of the screen, thereby improving driving safety; and

[0039] - The backlight brightness can be adjusted gradually, thus avoiding sudden changes in screen brightness and black screen phenomena during mode switching and brightness adjustment. Attached Figure Description

[0040] By incorporating the figures in this article and subsequently the accompanying figures Figure 1 The specific embodiments used to illustrate certain principles of the invention will make other features and advantages of the method of the invention clearer or more specifically explained.

[0041] Figure 1 A schematic diagram of a conventional in-vehicle infotainment system is shown.

[0042] Figure 2 A schematic diagram of a backlight adjustment device for a display screen according to an exemplary embodiment of the present invention is shown.

[0043] Figure 3 It shows Figure 2 The waveform diagram of the control signal of the backlight adjustment device under the first control strategy.

[0044] Figure 4 It shows Figure 2 The waveform diagram of the control signal of the backlight adjustment device under the second control strategy. Detailed Implementation

[0045] The backlight adjustment device for a display screen according to the present invention will now be described with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand the invention. However, it will be apparent to those skilled in the art that implementation of the invention may not include some of these specific details. Instead, the invention may be conceived to be practiced with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are illustrative only and should not be considered as elements or limitations of the claims.

[0046] Figure 1 A schematic diagram of a conventional in-vehicle infotainment system is shown. Assuming this system uses, for example, an LCD display 10, the liquid crystal needs to be illuminated by a backlight 101 located behind the LCD. Therefore, the system includes a backlight adjustment device that outputs a corresponding PWM signal to adjust the illumination of the backlight 101. Specifically, the backlight brightness of the backlight 101 can be determined based on the PWM signal. For example, the backlight brightness of the in-vehicle display is proportional to the duty cycle of the PWM dimming signal.

[0047] With the illumination of the backlight 101, and based on the video display data provided by the vehicle-mounted host 20, corresponding video entertainment information can be presented to the user on the display screen 10. Understandably, before providing the video data to the display screen, a deserializer is needed to convert and parse the raw data from the vehicle-mounted host 20, and the data is then processed in an ASIC (Application-Specific Integrated Circuit, which may be, for example, an FPGA) to ultimately convert it into a data format that the display screen can receive and process.

[0048] The vehicle host 20 and the backlight adjustment device can communicate via a CAN bus, so that the backlight adjustment device can receive control commands from the vehicle host 20, such as input commands from the user.

[0049] Conventional in-vehicle displays typically only offer one lighting mode: public mode. This mode not only fails to protect the privacy of the displayed content but also easily leads to driver distraction, causing them to unconsciously look at the screen while driving. Furthermore, directly adjusting the backlight brightness of the in-vehicle display using PWM signals can cause abrupt brightness fluctuations, severely impacting the user's viewing experience.

[0050] To address the aforementioned problems, this invention proposes a display screen backlight adjustment device with switchable illumination modes. In addition to the conventional public mode, the device adds a private mode, allowing the display screen's backlight illumination mode to switch freely between the two modes. In public mode, users can see the content displayed on the screen from all angles, similar to the backlight mode of a conventional in-vehicle display screen. In private mode, only users at specific angles (e.g., the front passenger seat) can see the content displayed on the screen. This not only effectively protects the privacy of the displayed content but also prevents driver distraction caused by involuntarily looking at the screen content, thereby improving driving safety. Furthermore, by controlling the backlight brightness variation curve, phenomena such as sudden changes in screen brightness and blackouts during mode switching and dimming can be avoided.

[0051] Figure 2 A schematic diagram of a backlight adjustment device for a display screen according to an exemplary embodiment of the present invention is shown.

[0052] like Figure 2 As shown, the device generally includes two backlight driver chips and five switches to support free switching between public mode and private mode of the backlight. When the control signal EN_PUBLIC from the MCU is enabled, the display operates in public mode; when the control signal EN_PRIVATE is enabled, the display operates in private mode. The display can freely switch between the two backlight modes via the MCU control signals EN_PUBLIC and EN_PRIVATE. The following section combines... Figure 2 Let's take a detailed look at the specific structure of this backlight adjustment device.

[0053] In addition to the MCU, the device also includes at least one driver chip. This article focuses on two driver chips as an example, namely, the first driver chip IC1 and the second driver chip IC2. Each driver chip is configured to drive the corresponding part of the backlight 101 disposed on the back of the display screen 10.

[0054] The electrical connection between driver chips IC1 and IC2 and the backlight 101 can be achieved using a switching assembly. The switching assembly's individual switches are controlled by the MCU to establish corresponding current paths based on the user's input instruction C_INPUT, thereby ultimately achieving the target backlight driving mode for driver chips IC1 and IC2. This backlight driving mode may include a first backlight mode (e.g., public mode) and a second backlight mode (e.g., private mode), and at least one driver chip includes a first driver chip IC1 and a second driver chip IC2.

[0055] Specifically, the MCU may include a first enable port PIN_A1 and a second enable port PIN_A2 corresponding to the first backlight mode and the second backlight mode, respectively. The controlled terminals of each switch in the switch assembly are respectively connected to the first enable port PIN_A1 or the second enable port PIN_A2 of the MCU, so as to form different current paths between the corresponding driver chips IC1, IC2 and the backlight 101 according to the output signals provided by the first enable port PIN_A1 and the second enable port PIN_A2.

[0056] The MCU may also include a first brightness adjustment port PIN_B1 and a second brightness adjustment port PIN_B2 respectively connected to the first driver chip IC1 and the second driver chip IC2. Thus, the backlight brightness of the backlight 101 can be adjusted using PWM signals PWM1 and PWM2 output from the MCU's brightness adjustment ports. Through dual control of the current path and the backlight brightness, corresponding backlight modes can be achieved.

[0057] like Figure 2 As shown, the switching assembly may include first to fourth switches SW1-SW4. By controlling the on / off state of each switch, different current paths can be formed between the driver chips IC1, IC2 and the backlight 101.

[0058] The first switch SW1 is connected between the first driver chip IC1 and the first enable port PIN_A1; the second switch SW2 is connected between the first driver chip IC1 and the second enable port PIN_A2; the third switch SW3 is connected between the second driver chip IC2 and the first enable port PIN_A1; and the fourth switch SW4 is connected between the second driver chip IC2 and the second enable port PIN_A2. Each of the first to fourth switches SW1, SW2, SW3, and SW4 is turned on when a high-level signal is received and turned off when a low-level signal is received.

[0059] In addition, the switching assembly may also include a master switch SW0, which is configured to start or stop the first driver chip IC1 and the second driver chip IC2 under the control of the MCU.

[0060] The MCU can receive input commands from the user (which can be signals from the CAN bus, physical buttons in the vehicle infotainment system, touch buttons, or gesture recognition, etc.) and output corresponding backlight mode enable signals via enable ports PIN_A1 and PIN_A2 based on the commands. EN_PUBLIC represents the public mode enable signal, and EN_PRIVATE represents the privacy mode enable signal; a high level indicates enable / start, and a low level indicates disable. The backlight brightness is determined by the PWM signals provided by the MCU's brightness adjustment ports PIN_B1 and PIN_B2.

[0061] In the backlight adjustment device of the present invention, it is assumed that the default mode is the first backlight mode (i.e., the common mode). When a user instruction instructs the display screen 10 to enter this default mode, the MCU first turns on the master control switch SW0 to activate the first driver chip IC1 and the second driver chip IC2; subsequently, it sets the output signal of the first enable port PIN_A1 to a high level to activate the common mode. Correspondingly, the backlight brightness of the driver chips IC1 and IC2 is increased from the current value to the target value via the first brightness adjustment port PIN_B1. Thus, the entire process of putting the display screen into the default mode is realized.

[0062] In addition to the default mode mentioned above, the backlight adjustment device based on the present invention, especially with the help of an MCU, can also implement a variety of other control strategies. Figure 3 It shows Figure 2 The waveform diagram of the control signal of the backlight adjustment device under the first control strategy.

[0063] See Figure 3 When the MCU receives an instruction from the user to switch the display 10 from a first backlight mode (e.g., public mode) to a second backlight mode (e.g., privacy mode), the MCU may execute the following steps in sequence:

[0064] – At the first moment T1, set the output signal EN_PRIVATE of the second enable port PIN_A2 to a high level; and

[0065] – At the second time T2, the output signal EN_PUBLIC of the first enable port PIN_A1 is set to low. The second time T2 is after the first time T1 and is spaced apart from the first time T1 by a predetermined duration ΔT, which can be set to, for example, 1m to 5ms. This completes the switch from public mode to privacy mode.

[0066] As a result, due to the current shunting caused by the activation of the backlight corresponding to the privacy mode, the backlight brightness of the backlight corresponding to the public mode decreases from its current value to the set value starting from the first moment T1, while the backlight brightness of the backlight corresponding to the privacy mode increases from its current value to the target value. Therefore, visually, users will not perceive a significant change in brightness when switching between lighting modes.

[0067] It is conceivable that, in relation to Figure 3 In a contrasting example of the embodiment, when a user-received instruction instructs the display 10 to switch from a second backlight mode (e.g., privacy mode) to a first backlight mode (e.g., public mode), the MCU may sequentially perform the following steps:

[0068] – At the first moment T1, set the output signal EN_PUBLIC of the first enable port PIN_A1 to a high level; and

[0069] – At the second time T2, the output signal EN_PRIVATE of the second enable port PIN_A2 is set to low. The second time T2 is after the first time T1 and is spaced apart from the first time T1 by a predetermined duration ΔT, which can be set to, for example, 1m to 5ms. This completes the switch from privacy mode to public mode.

[0070] As a result, due to the current shunting caused by the activation of the backlight corresponding to the public mode, the backlight brightness of the backlight corresponding to the privacy mode will decrease from the current value to the set value starting from the first moment T1, while the backlight brightness of the backlight corresponding to the public mode will increase from the current value to the target value.

[0071] During the aforementioned mode switching process, the final backlight brightness achieved by the increased backlight can be equal to the initial backlight brightness value of the decreased backlight before the switch, or it can be a target backlight brightness value specifically set for the switched mode. During this mode switching process, the coordination between the two enable signals and the brightness adjustment signal prevents black screen issues caused by switching between different modes.

[0072] Figure 4 It shows Figure 2 The waveform diagram of the control signal for the backlight adjustment device under the second control strategy (also known as the "fade-out and fade-in control strategy"). Figure 3 The difference in the first control strategy lies in that, when the execution mode switches, the MCU can adjust the backlight brightness of the driver chips IC1 and IC2 from their current values ​​to the corresponding preset values ​​in predetermined steps, for example, 5% PMW per second. See below for reference. Figure 4 Let's take a closer look at this control strategy.

[0073] See Figure 4 C_INPUT represents an input request signal; a high level indicates common mode, and a low level indicates privacy mode. This input request signal can come from sources such as the vehicle's CAN bus, physical buttons in the in-vehicle infotainment system, touch buttons, or gesture recognition signals.

[0074] PWM represents the backlight brightness value. Figure 4 The 50% PWM value represents the backlight brightness value at the start of the current mode switching, or the backlight brightness value in another mode at the end of the switching. It can be set to any value from the minimum PWM value to 100% PWM value. The 10% PWM value represents the minimum PWM value, which can be customized according to the actual situation. This value can be taken from the EEPROM in the MCU.

[0075] During brightness adjustment, the fade-out step size (i.e., the amount of PMW adjusted per second) or number of steps (e.g., the total number of steps to gradually decrease from 50% PWM to 10% PWM) and the fade-in step size or number of steps (e.g., the total number of steps to gradually increase from 10% PWM to 50% PWM) can be set to be the same or different from each other, and the starting and ending values ​​of the fade-out and fade-in can also be the same or different from each other. In short, this step size / number of steps can be customized or adjusted according to the actual situation, and it can be taken from the EEPROM.

[0076] When the C_INPUT signal changes from high to low, it indicates that the user wants to switch the display 10 from a first backlight mode (e.g., public mode) to a second backlight mode (e.g., privacy mode). At this time, the MCU can execute the following steps in sequence:

[0077] - At the first moment T1, the backlight brightness of the driver chips IC1 and IC2 is reduced from the current value (e.g., 50% PWM) to the set value (e.g., 10% PWM) by a step length;

[0078] - When the backlight brightness of driver chips IC1 and IC2 reaches the set value, the output signal EN_PRIVATE of the second enable port is set to high level at the second time T2 after the first time T1; and

[0079] - At the third time T3, the output signal of the first enable port is set to low level EN_PUBLIC, and the backlight brightness of driver chips IC1 and IC2 is increased to the target value (e.g., 50% PWM) in a second step. The third time T3 is after the second time T2 and is spaced apart from the second time T2 by a predetermined duration ΔT, which can be set to, for example, 1m to 5ms. This completes the switch from public mode to privacy mode.

[0080] It is conceivable that, in relation to Figure 4In a contrasting example of the embodiment, when the C_INPUT signal transitions from low to high, it indicates that the user wishes to switch the display 10 from a second backlight mode (e.g., privacy mode) to a first backlight mode (e.g., public mode). The MCU can then execute the following steps in sequence:

[0081] - At the first moment T1, the backlight brightness of the driver chips IC1 and IC2 is reduced from the current value (e.g., 50% PWM) to the set value (e.g., 10% PWM) by a step length;

[0082] - When the backlight brightness of driver chips IC1 and IC2 reaches the set value, at the second moment T2, the output signal EN_PUBLIC of the first enable port is set to a high level; and

[0083] - At the third time T3, the output signal of the second enable port is set to low level EN_PRIVATE, and the backlight brightness of driver chips IC1 and IC2 is increased to the target value (e.g., 50% PWM) in a second step. The third time T3 is after the second time T2 and is spaced apart from the second time T2 by a predetermined duration ΔT, which can be set to, for example, 1m to 5ms. This completes the switch from privacy mode to public mode.

[0084] During the aforementioned mode switching process, the final backlight brightness achieved by the increased backlight (i.e., 50% PWM) can be equivalent to the initial backlight brightness value of the decreased backlight before the switch, or it can be a target backlight brightness value specifically set for the switched mode. During this mode switching process, based on the coordination between the two enable signals and the brightness adjustment signal, a smooth transition between the two modes can be achieved, preventing black screen phenomena caused by switching between different modes.

[0085] The advantages of the backlight adjustment device for a display screen according to the present invention compared to conventional backlight adjustment devices include:

[0086] - It provides two backlighting modes and allows for free switching between different backlighting modes, thus ensuring that a suitable lighting mode can be provided for different user needs;

[0087] - In private mode, only users in specific positions (e.g., the front passenger seat) can see the content displayed on the screen. This not only effectively protects the privacy of the displayed content but also prevents driver distraction caused by involuntary viewing of the screen, thereby improving driving safety; and

[0088] - The backlight brightness can be adjusted gradually, thus avoiding sudden changes in screen brightness and black screen phenomena during mode switching and brightness adjustment.

[0089] It will be understood by those skilled in the art that the steps of the method according to the present invention are not limited to being performed in the order listed above. Although the present invention has been disclosed above with reference to preferred embodiments, the present invention is not limited thereto. Any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A backlight adjustment device for a display screen (10), the device comprising at least one driving chip configured to drive a backlight source (101) arranged at the back of the display screen (10), and an MCU for adjusting a backlight mode of the at least one driving chip according to an input instruction (C INPUT) from a user, characterized in that, the device further comprises a switch assembly configured to form different current paths between the at least one driving chip and the backlight source (101), the backlight mode comprises a first backlight mode and a second backlight mode, the MCU comprises a first enable port (PIN_A1) and a second enable port (PIN_A2) corresponding to the first backlight mode and the second backlight mode respectively, a controlled end of the switch assembly is connected to the first enable port (PIN_A1) and the second enable port (PIN_A2) so as to form different current paths between the at least one driving chip and the backlight source (101) according to output signals provided by the first enable port (PIN_A1) and the second enable port (PIN_A2), wherein the MCU is configured to selectively control the on-off of each switch in the switch assembly based on the input instruction from the user to adjust the display screen (10) to a specified backlight mode, wherein the MCU is further configured to perform the following steps when receiving an input instruction to switch the display screen (10) from the first backlight mode to the second backlight mode: at a first time (T1), setting the output signal (EN_PRIVATE) of the second enable port (PIN_A2) to a high level; and at a second time (T2) after the first time (T1), setting the output signal (EN_PUBLIC) of the first enable port (PIN_A1) to a low level, wherein the second time (T2) is spaced apart from the first time (T1) by a predetermined time length (ΔT), wherein each switch in the switch assembly is configured to be turned on when receiving a high level signal and turned off when receiving a low level signal. the at least one driving chip comprises a first driving chip (IC1) and a second driving chip (IC2), and the switch assembly comprises a first to fourth switch (SW1, SW2, SW3, SW4), wherein, 2. The backlight adjustment apparatus according to claim 1, wherein the first switch (SW1) is connected between the first driving chip (IC1) and the first enable port (PIN_A1); the second switch (SW2) is connected between the first driving chip (IC1) and the second enable port (PIN_A2); the third switch (SW3) is connected between the second driving chip (IC2) and the first enable port (PIN_A1); and the fourth switch (SW4) is connected between the second driving chip (IC2) and the second enable port (PIN_A2). ​ 3. The backlight adjustment apparatus according to claim 2, wherein Each of the first to fourth switches (SW1, SW2, SW3, SW4) is turned on when receiving a high-level signal and turned off when receiving a low-level signal.

4. The backlight adjustment apparatus according to any one of claims 1 to 3, wherein The switch assembly further comprises a master switch (SW0) configured to start or stop the at least one driving chip under the control of the MCU.

5. The backlight adjustment apparatus of claim 4, wherein The MCU further comprises at least one brightness adjustment port (PIN_B1, PIN_B2) connected to the at least one driving chip, and the MCU is further configured to perform the following steps when receiving an input instruction to adjust the display screen (10) to a first backlight mode: turning on the master switch (SW0) to start the at least one driving chip; setting the output signal of the first enable port (PIN_A1) to a high level; and outputting a corresponding brightness adjustment signal via the at least one brightness adjustment port (PIN_B1, PIN_B2) to increase the backlight brightness of the at least one driving chip from a current value to a target value.

6. The backlight adjustment device according to any one of claims 1 to 3, wherein the first backlight mode is a public backlight mode, and the second backlight mode is a privacy backlight mode.

7. The backlight adjustment apparatus of claim 5, wherein The brightness adjustment signal outputted by the at least one brightness adjustment port (PIN_B1, PIN_B2) is a PWM signal.

8. A vehicle display, characterized by The vehicle-mounted display comprises: a display screen (10); a backlight source (101) arranged at the back of the display screen (10) to provide corresponding backlight illumination to the display screen (10); and the backlight adjustment device according to any one of claims 1 to 7, which is used to adjust the illumination of the backlight source (101).

9. An in-vehicle infotainment system, characterized by, The system comprises: the vehicle-mounted display according to claim 8; and a vehicle-mounted host (20) configured to provide a video signal to be displayed to the vehicle-mounted display. The system comprises: the vehicle-mounted display according to claim 8; and a vehicle-mounted host (20) configured to provide a video signal to be displayed to the vehicle-mounted display.

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