Vehicle-mounted display dynamic backlight temperature control operation system

Abstract

The invention provides a vehicle-mounted display dynamic backlight temperature control operation system, and relates to the technical field of vehicle-mounted display. The system comprises a temperature detection module, a main control unit, a heat dissipation execution module and a backlight driving module, and stable operation of a vehicle-mounted backlight module in an extreme environment is achieved by constructing a closed-loop control system of temperature sensing, intelligent decision making and accurate execution. The temperature detection module adopts a distributed NTC thermistor and collects temperature data of the center and the edge of a Min-LED lamp panel and a light guide plate at the frequency of 10 Hz, a dynamic temperature threshold model and a PI D closed-loop control algorithm are built in the main control unit, and backlight parameters are adjusted in real time according to temperature deviation; the heat dissipation execution module adopts the combination of a miniature liquid cooling fin and a speed-adjustable fan for heat dissipation; the system is in communication with a vehicle-mounted central control through a CAN bus, high-temperature early warning and fault uploading are achieved, the system can work stably in the environment of-40 DEG C to 125 DEG C, the reliability of vehicle-mounted display and user experience are remarkably improved, and the system is suitable for various vehicle-mounted Min i-LED display scenes.

Description

Technical Field

[0001] This invention belongs to the field of automotive display technology, and more specifically, relates to an automotive display dynamic backlight temperature control operating system. Background Technology

[0002] As the core interface for human-machine interaction in vehicles, the display system's performance and stability directly impact driving safety and user experience. With the widespread adoption of Mini-LED technology in the automotive field, the brightness, contrast, and local dimming capabilities of backlight modules have significantly improved. However, they also face the challenge of temperature control in extreme environments—vehicle scenarios must withstand a wide temperature range of -40℃ to 85℃, severe vibrations, and localized high temperatures caused by direct sunlight. These factors can all lead to performance degradation or even failure of the backlight module.

[0003] Current automotive backlight temperature control technology has the following prominent problems:

[0004] Traditional temperature control methods are crude and struggle to balance display quality and safety. Existing systems often employ a "fixed threshold + overall brightness reduction" control logic. For example, when the backlight module temperature exceeds 65°C, regardless of whether it's localized or overall overheating, the overall backlight brightness is reduced by more than 50%, leading to a sharp deterioration in display quality (such as blurred details in navigation maps). This method fails to consider the differences in heat source distribution across different areas, resulting in wasted performance and an inability to accurately address localized overheating (such as the high heat flux density in the center of a Mini-LED light panel).

[0005] Insufficient temperature detection accuracy and delayed response: Traditional systems often place a single temperature sensor at the edge of the backlight module with a sampling frequency of ≤5Hz, which cannot capture temperature changes in core heat-generating areas such as the center of the lamp board, resulting in a temperature detection deviation of ±3℃ or more. When direct sunlight causes a sudden rise in local temperature, the system often only triggers protection after the temperature exceeds the safety threshold. By this time, the LEDs have already experienced light decay due to overheating, or even permanent damage.

[0006] The heat dissipation solutions have poor adaptability and a high risk of failure in extreme environments: Existing automotive backlights mostly rely on a single fan for cooling, with a fixed fan speed (e.g., 3000 rpm). In high-temperature environments (e.g., exposure to direct sunlight at 60°C inside a car), the cooling capacity is insufficient, causing the backlight module temperature to rise continuously. In low-temperature environments (e.g., -30°C), the fan running idle not only wastes energy but may also cause mechanical failure due to lubricant solidification. Furthermore, the heat dissipation structure is not optimized for the zoned heat sources of Mini-LEDs, and cannot cope with localized high heat flux densities (>10W / cm²). 2 ).

[0007] Insufficient low-temperature adaptability and prominent start-up and stability issues: In low-temperature environments, the luminous efficiency of Mini-LED chips decreases by more than 30%, and optical inhomogeneity may occur in the light guide plate due to material shrinkage; at the same time, moisture in the air easily condenses into fog on the surface of the light guide plate, resulting in blurred display. Traditional systems lack targeted design, with low-temperature start-up times exceeding 10 seconds, initial brightness only 50% of the rated value, and no anti-fogging function, seriously affecting low-temperature driving safety.

[0008] Lack of coordination with the vehicle system and insufficient reliability assurance: Most existing backlight temperature control systems operate in an independent mode and cannot upload temperature status and fault information to the vehicle's central control system. When there is a risk of overheating, the driver may not be able to detect it in time. Furthermore, they are not optimized for vehicle vibration, electromagnetic interference and other operating conditions. After long-term use, they are prone to problems such as sensor false alarms and drive circuit failures, which do not meet the ISO16750 automotive-grade reliability standard.

[0009] Therefore, developing a backlight temperature control system that can accurately sense temperature distribution, dynamically balance heat dissipation and display effect, and adapt to extreme vehicle environments has become the key to solving the reliability problem of Mini-LED vehicle displays, and is of great significance to improving the safety and user experience of vehicle displays. Summary of the Invention

[0010] To address the aforementioned technical problems, this invention provides an in-vehicle display dynamic backlight temperature control operating system.

[0011] The vehicle-mounted display dynamic backlight temperature control operating system includes:

[0012] The temperature detection module is used to collect temperature data of the vehicle display backlight module in real time. The backlight module includes a Mini-LED lamp board, a light guide plate, and a glue and iron assembly.

[0013] The main control unit communicates with the temperature detection module and has a built-in backlight parameter database and temperature threshold model.

[0014] The heat dissipation module includes a miniature liquid-cooled heat sink and an adjustable-speed fan, and is controlled by the main control unit;

[0015] The backlight driver module is used to adjust the luminous power and zoned brightness of the Mini-LED light panel;

[0016] The main control unit dynamically calls the backlight driver module to adjust the brightness of each zone based on temperature data, and coordinates the start and stop of the heat dissipation execution module to achieve coordinated control of the backlight module temperature and display effect.

[0017] Preferably, the temperature detection module includes at least three distributed NTC thermistors, which are respectively attached to the center area, edge area and light-emitting surface of the Mini-LED light board, with a sampling frequency of 10Hz, a temperature detection range of -40℃ to 125℃, and a detection accuracy of ±0.5℃.

[0018] Preferably, the temperature threshold model of the main control unit adopts a dynamic correction formula:

[0019] T_target = T_base - k × L_avg;

[0020] Where T_target is the safe temperature threshold at the current brightness, T_base is the reference temperature (taken as 60℃ in a 25℃ environment), k is the correction coefficient (taken as 0.02℃ / nit), and L_avg is the average brightness of the backlight module (unit nit).

[0021] Preferably, the liquid-cooled heat sink of the heat dissipation execution module adopts a microchannel structure with a channel diameter of 0.8mm and a heat dissipation area of ​​≥50cm². 2 The adjustable speed fan has a speed range of 1500-5000rpm and an air volume of 10-30CFM. When the detected temperature exceeds 80% of T_target, it starts at a low speed, and when it exceeds T_target, it starts at a high speed.

[0022] Preferably, the backlight driver module uses a PID closed-loop control algorithm for zoned brightness adjustment, and the algorithm formula is as follows:

[0023] U(k)=Kp×e(k)+Ki×Σe(j)+Kd×[e(k)-e(k-1)];

[0024] Where U(k) is the current output PWM duty cycle adjustment amount, e(k) is the deviation between the current temperature and the target temperature, Kp = 0.3-0.8, Ki = 0.05-0.2, Kd = 0.1-0.4, and the sampling period is 50ms.

[0025] Preferably, the Mini-LED light panel is divided into 64-1024 independent light control zones, each containing 12-24 Mini-LED chips. The backlight driving module can adjust the current (range 5-30mA) and light emission duration of each zone individually. When the temperature of a single zone exceeds 70°C, the current of that zone is automatically reduced by 10%-30%.

[0026] Preferably, the main control unit also has built-in low temperature compensation logic: when the ambient temperature is below -20℃, a 0.5V pre-drive voltage is applied to the Mini-LED light board through the preheating circuit, and the normal backlight is started after 3-5 seconds to avoid brightness decay caused by low temperature.

[0027] Preferably, the linkage logic between the heat dissipation execution module and the backlight driving module is as follows:

[0028] When the detected temperature T ≤ 50°C, only control the temperature by adjusting the zonal brightness, and the fan stops;

[0029] When 50°C < T ≤ 65°C, the fan runs at 3000 rpm, and at the same time, the maximum backlight brightness is limited to 800 nit;

[0030] When 65°C < T ≤ 75°C, the fan runs at full speed, and the maximum backlight brightness drops to 500 nit;

[0031] When T > 75°C, trigger overheat protection, turn off the backlight in the non-display core area, and only retain the emergency display mode with 20% brightness.

[0032] Preferably, the main control unit communicates with the vehicle-mounted central control system through the CAN bus, and uploads the temperature curve, heat dissipation status and fault code of the backlight module in real time. When the temperature exceeds 85°C for 30 consecutive seconds, trigger the high-temperature alarm prompt on the vehicle-mounted dashboard.

[0033] Preferably, the backlight parameter database contains the brightness-temperature correspondence relationships under different vehicle specification environments, such as:

[0034] High-temperature exposure mode (ambient temperature 60°C): The default brightness limit is 400 nit, and the brightness decreases by 20 nit for each 1°C increase;

[0035] Low-temperature severe cold mode (ambient temperature -30°C): The default brightness is increased to 1200 nit, start the anti-fogging heating function, and the heating power is 5 W.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The display stability in extreme environments is significantly improved: The system realizes the real-time binding of brightness and temperature through distributed temperature detection (covering the center, edge of the Mini-LED light board and the light guide plate) and the dynamic threshold model (T_target = T_base - k × L_avg). In a 60°C high-temperature environment, the maximum stable brightness can reach 800 nit, which is improved compared with the traditional system, and the temperature fluctuation is controlled within ±2°C; in a -30°C low-temperature environment, the startup time is shortened from 12 seconds to 4 seconds through the preheating logic (0.5V pre-driving), and the initial brightness is restored to 95% of the rated value, solving the problems of brightness attenuation and slow startup of the traditional system in extreme temperatures.

[0038] 2. Precise local overheat control to prevent display degradation: Utilizing a design with 256-1024 independent light-control zones (12-24 Mini-LEDs per zone), combined with zone current adjustment (5-30mA), it can precisely reduce current by 10%-30% for a single overheated zone (temperature > 70℃), rather than the traditional method of reducing brightness across the entire area. In dynamic temperature control testing, this design can restore stability to an overheated area in just 8 seconds, with brightness fluctuations ≤ ±5%, preventing overall display degradation caused by localized high temperatures. This is especially suitable for high-contrast display scenarios such as in-vehicle navigation.

[0039] 3. Optimized balance between heat dissipation efficiency and energy consumption: Liquid cooling (microchannel diameter 0.8mm, heat dissipation area ≥50cm²) 2 The combination of a fan and an adjustable-speed fan (1500-5000rpm) achieves dynamic matching of heat dissipation capacity: the fan runs at full speed to enhance heat dissipation at high temperatures (above 65℃), and stops at low temperatures (≤50℃) to save energy. Test data shows that the system's average power consumption is reduced by 33.3% compared to the traditional constant cooling mode (from 12W to 8W), while still maintaining the temperature at 68℃ under 1200nit high brightness, which is 20℃ lower than the traditional system.

[0040] 4. Automotive-grade reliability and intelligent integration: The system communicates with the vehicle's central control unit via CAN bus, uploading temperature curves and fault codes in real time. When the temperature exceeds 85℃ for 30 consecutive seconds, an alarm is triggered on the instrument panel, complying with the ISO16750 automotive electronic equipment reliability standard. Features such as low-temperature anti-fogging heating (5W power) and wide-temperature-range coolant (-45℃~108℃) ensure long-term stable operation under vehicle conditions including vibration and high / low temperature cycling, with a batch test failure rate controlled below 0.5%.

[0041] 5. Algorithm-driven precise control significantly improves response speed.

[0042] The PID closed-loop control algorithm (Kp=0.5, Ki=0.1, Kd=0.2, 50ms sampling period) reduces the temperature response time from 15 seconds in the traditional system to 2 seconds and the overshoot from 8℃ to 1℃. It solves the problems of "cooling lag" or "excessive brightness reduction" in the traditional open-loop control, realizes smooth adjustment of temperature and brightness, and improves the consistency of the user's visual experience. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating the present invention. Detailed Implementation

[0044] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0045] Please see Figure 1 This invention provides a dynamic backlight temperature control operating system for automotive displays, aiming to solve the problem of performance degradation of backlight modules in traditional automotive display systems under high temperature, low temperature, and vibration environments. The system collects real-time temperature data from key locations on the backlight module through a temperature detection module. The main control unit dynamically adjusts the backlight zone brightness based on a preset temperature threshold model and PID control algorithm, and coordinates with the heat dissipation execution module to achieve precise temperature control, ensuring that the automotive display maintains stable brightness and uniformity even in extreme environments ranging from -40℃ to 125℃.

[0046] The system architecture includes:

[0047] Temperature detection module: Utilizing a distributed NTC thermistor network, at least one thermistor is placed in each of the Mini-LED light panel's central area (heat source concentration area), edge area (heat diffusion area), and light-emitting surface of the light guide plate (a critical location affecting display performance). The thermistors sample at a frequency of 10Hz, enabling real-time capture of temperature changes with a detection accuracy of ±0.5℃, ensuring rapid response to temperature anomalies.

[0048] Main control unit: Integrates a temperature threshold model and a PID control algorithm. The temperature threshold model dynamically adjusts the safe temperature threshold based on the current backlight brightness (formula: T_target = T_base - k × L_avg), where the reference temperature T_base is 60℃ in a 25℃ environment, and the correction coefficient k is 0.02℃ / nit, achieving coordinated control of brightness and temperature. The PID algorithm adjusts the PWM duty cycle in real time by calculating the temperature deviation, with control parameters Kp = 0.5, Ki = 0.1, Kd = 0.2, and a sampling period of 50ms, ensuring rapid system response and no overshoot.

[0049] Cooling module: Employs a combination of miniature liquid-cooled heatsinks and an adjustable-speed fan for heat dissipation. The liquid-cooled heatsink has a microchannel diameter of 0.8mm and an effective heat dissipation area of ​​≥50cm². 2 The coolant is an aqueous ethylene glycol solution (freezing point -45℃, boiling point 108℃), ensuring normal operation even under extreme temperatures. The adjustable fan speed ranges from 1500-5000 rpm, with an airflow of 10-30 CFM, intelligently adjusting according to temperature gradients.

[0050] Backlight driver module: The Mini-LED panel is divided into 256 independent light-control zones (suitable for 12.3-inch displays). Each zone contains 16 Mini-LED chips, and the current (5-30mA) and illumination duration can be independently adjusted. When the temperature of a single zone exceeds 70℃, the current of that zone is automatically reduced by 20%, achieving precise control of local overheating.

[0051] The system workflow is as follows: the temperature detection module collects temperature data in real time and transmits it to the main control unit. The main control unit compares the current temperature with a dynamic threshold, calculates the output value using a PID algorithm, and adjusts the brightness of the backlight zones. Simultaneously, it controls the fan speed and liquid cooling circulation of the heat dissipation module based on the temperature gradient. The entire process forms a closed-loop control, ensuring that the backlight module always operates within a safe temperature range.

[0052] Example 1: Temperature control performance test under high temperature environment (ambient temperature 60℃):

[0053] Test Project Traditional system This invention system Improvement effect Maximum stable brightness 450nit 800nit +77.8％ Brightness uniformity 82％ 94％ +14.6％ Temperature fluctuation range ±8℃ ±2℃ -75％ Duration of high temperature Brightness will decrease after 30 minutes. No brightness reduction for 2 hours +300％ Fan power consumption constant 12W Average 8W (dynamically adjusted) -33.3％

[0054] Test conditions: Direct sunlight simulation box, backlight module operating at full load. This invention's system maintains stable high brightness output in high-temperature environments through a dynamic threshold model (T_target = 60 - 0.02 × 800 = 44℃) and zoned light control, while the intelligent cooling system reduces energy consumption.

[0055] Example 2: Low-temperature start-up performance test (ambient temperature -30℃):

[0056] Test Project Traditional system This invention system Improvement effect Startup time 12 seconds 4 seconds -66.7％ initial brightness 30% rating 95% of the rated value +216.7％ Brightness recovery time 90 seconds 15 seconds -83.3％ Fog conditions Severe fog No fogging Completely eliminate Low temperature operation stability Brightness fluctuation ±15% Brightness fluctuation ±3% -80％

[0057] Test conditions: Low-temperature test chamber, backlight module powered off for 12 hours before startup. This invention's system utilizes low-temperature compensation logic to apply a 0.5V pre-drive voltage for 3 seconds of preheating, while simultaneously activating a 5W anti-fogging heating function, achieving rapid cold start and stable display.

[0058] Example 3: Dynamic Temperature Control Response Test (Temperature Sudden Change Scenario):

[0059]

[0060]

[0061] Test conditions: Under stable operation at 50℃, the temperature of a local heat source was suddenly increased to 80℃. The system of this invention responds quickly using a PID algorithm (Kp=0.5, Ki=0.1, Kd=0.2), detecting the temperature change within 2 seconds and reducing the brightness of the corresponding zone. The system recovers stability within 8 seconds, avoiding the problem of overall brightness reduction in traditional systems.

[0062] Example 4: Comparison of temperature control effects under different brightness levels (ambient temperature 25℃):

[0063]

[0064] Test conditions: Ambient temperature 25℃, continuous operation for 2 hours. This invention's system adjusts its temperature control strategy in real time using a dynamic threshold model (T_target = 60 - 0.02 × L_avg), resulting in significantly lower temperatures than traditional systems in high-brightness scenarios, while also reducing overall power consumption through intelligent heat dissipation.

[0065] The vehicle display dynamic backlight temperature control operating system disclosed in this invention systematically solves the stability problem of backlight modules in extreme environments in the field of vehicle displays by constructing a closed-loop control system of "temperature sensing-intelligent decision-precise execution". It provides an innovative solution for high-temperature reliability, low-temperature rapid response and energy consumption balance of vehicle displays.

[0066] From a technical perspective, the system's core advantage lies in breaking away from the crude approach of "single heat dissipation" or "simple brightness reduction" in traditional backlight temperature control. Instead, it achieves refined control through multi-dimensional collaboration: the distributed layout of the temperature detection module (covering the center, edges, and light guide plate of the lamp panel) ensures comprehensive capture of heat sources, and the 10Hz sampling frequency and ±0.5℃ accuracy provide a precise data foundation for subsequent decisions; the dynamic temperature threshold model (T_target=T_base-k×L_avg) of the main control unit realizes dynamic binding between brightness and temperature, avoiding performance waste or protection lag caused by fixed thresholds; the PID closed-loop control algorithm calculates the temperature deviation in real time and precisely adjusts the PWM duty cycle of the backlight driver, shortening the system response time to the 50ms level and controlling the overshoot within 1℃, thus solving the problem of large temperature fluctuations in traditional open-loop control.

[0067] At the hardware coordination level, the combination of liquid cooling and local dimming provides a dual guarantee of "active heat dissipation + passive temperature control": the microchannel design (0.8mm diameter) and large heat dissipation area (≥50cm²) of the liquid cooling fins... 2 This design enhances heat dissipation in high heat flux density areas, while the 256 independent dimming zones (16 Mini-LEDs per zone) allow for precise current reduction in response to localized overheating, avoiding the display degradation caused by traditional full-area brightness reduction. In high-temperature environments (such as exposure to 60℃ sunlight), this design can increase the maximum stable brightness to 800 nits, a 77.8% improvement over traditional systems, while keeping temperature fluctuations within ±2℃.

[0068] Addressing the unique characteristics of in-vehicle environments, the system incorporates low-temperature adaptability design: preheating logic (0.5V pre-drive voltage) below -20℃ and anti-fogging heating function, resolving pain points such as slow low-temperature start-up, brightness decay, and fogging, reducing start-up time from 12 seconds to 4 seconds, and restoring initial brightness to 95% of the rated value. Furthermore, communication with the vehicle's central control system via the CAN bus enables real-time uploading of temperature status and fault warnings; an alarm is triggered when the temperature exceeds 85℃ for 30 consecutive seconds, meeting automotive-grade reliability requirements.

[0069] In summary, this invention, through intelligent design that integrates hardware and software, not only meets the performance requirements of automotive displays in extreme environments ranging from -40℃ to 125℃, but also achieves a balance between energy consumption and display effect. Its core innovation lies in the deep integration of dynamic threshold model with zoned light control and precise heat dissipation, providing an industrializable technical path for high brightness and high reliability of next-generation automotive displays.

[0070] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A vehicle-mounted display dynamic backlight temperature control operating system, characterized in that, It includes: A temperature detection module, which is used to collect the temperature data of the in-vehicle display backlight module in real time. The backlight module includes a Mini-LED light board, a light guide plate and a glue-iron component; A main control unit, which is communicatively connected to the temperature detection module and internally contains a backlight parameter database and a temperature threshold model; A heat dissipation execution module, which includes a micro liquid-cooled heat sink and an adjustable-speed fan and is controlled by the main control unit; A backlight driving module, which is used to adjust the luminous power and zonal brightness of the Mini-LED light board; Among them, the main control unit dynamically calls the backlight driving module according to the temperature data to adjust the zonal brightness, and联动 the heat dissipation execution module to start and stop, so as to realize the coordinated control of the backlight module temperature and the display effect.

2. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 1, characterized in that, The temperature detection module includes at least 3 distributed NTC thermistors, which are respectively attached to the central area, the edge area of the Mini-LED light board and the light-emitting surface of the light guide plate. The sampling frequency is 10Hz, the temperature detection range is -40°C to 125°C, and the detection accuracy is ±0.5°C.

3. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 2, characterized in that, The temperature threshold model of the main control unit adopts a dynamic correction formula: T_target = T_base - k × L_avg; Among them, T_target is the safety temperature threshold under the current brightness, T_base is the reference temperature, k is the correction coefficient, and L_avg is the average brightness of the backlight module.

4. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 3, characterized in that, The liquid-cooled heat sink of the heat dissipation module adopts a microchannel structure with a channel diameter of 0.8mm and a heat dissipation area of ​​≥50cm². 2 ; The rotation speed range of the adjustable-speed fan is 1500 - 5000 rpm, and the air volume is 10 - 30 CFM. When the detected temperature exceeds 80% of T_target, it starts at a low speed, and when it exceeds T_target, it starts at a high speed.

5. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 4, characterized in that, The zonal brightness adjustment of the backlight driving module adopts a PID closed-loop control algorithm, and the algorithm formula is: U(k) = Kp × e(k) + Ki × Σe(j) + Kd × [e(k) - e(k - 1)]; Among them, U(k) is the current output PWM duty cycle adjustment amount, e(k) is the deviation between the current temperature and the target temperature, Kp = 0.3 - 0.8, Ki = 0.05 - 0.2, Kd = 0.1 - 0.4, and the sampling period is 50ms.

6. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 5, characterized in that, The Mini-LED light board is divided into 64 - 1024 independent light control zones, and each zone contains 12 - 24 Mini-LED chips. The backlight driving module can independently adjust the current and luminous duration of each zone. When the temperature of a single zone exceeds 70°C, the current of that zone is automatically reduced by 10% - 30%.

7. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 6, characterized in that, The main control unit also internally contains a low-temperature compensation logic: when the ambient temperature is lower than -20°C, a 0.5V pre-driving voltage is applied to the Mini-LED light board through a preheating circuit, and after 3 - 5 seconds, the normal backlight is started to avoid brightness attenuation caused by low temperature.

8. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 7, characterized in that, The linkage logic between the heat dissipation execution module and the backlight driving module is: When the detected temperature T ≤ 50°C, only control the temperature by adjusting the zonal brightness, and the fan stops; When 50°C < T ≤ 65°C, the fan runs at 3000 rpm, and at the same time, the maximum backlight brightness is limited to 800 nit; When 65°C < T ≤ 75°C, the fan runs at full speed, and the maximum backlight brightness drops to 500 nit; When T>75℃, overheat protection is triggered, the backlight of non-display core areas is turned off, and only an emergency display mode with 20% brightness is retained.

9. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 8, characterized in that, The main control unit communicates with the vehicle's central control system via the CAN bus, uploading the temperature curve, heat dissipation status, and fault codes of the backlight module in real time. When the temperature exceeds 85°C for 30 consecutive seconds, it triggers a high-temperature alarm on the vehicle's instrument panel.

10. The vehicle-mounted display dynamic backlight temperature control operating system as described in claim 9, characterized in that, The backlight parameter database contains brightness-temperature correspondences under different automotive-grade environments: High temperature exposure mode: The default brightness limit is 400 nits, and the brightness decreases by 20 nits for every 1°C increase in temperature; Low temperature and severe cold mode: The default brightness is increased to 1200 nits, and the anti-fogging heating function is activated with a heating power of 5W.

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