Automobile display screen brightness adjusting system and method and automobile

Abstract

The invention provides an automobile display screen brightness adjusting system and method and an automobile, and relates to the technical field of automobile display, and the adjusting system comprises a light sensing unit which is used for periodically collecting the forward light intensity and the longitudinal light intensity of the automobile; the processing unit is used for calculating and generating corresponding ambient light intensity according to the forward light intensity and the longitudinal light intensity of the same period, performing statistical processing on all the ambient light intensity, and generating a corresponding brightness adjusting instruction according to a statistical result; and the screen control unit is used for adjusting the display brightness of a plurality of vehicle-mounted screens according to the brightness adjusting instruction. The situation that the screen brightness frequently jumps along with the change of ambient light is reduced, visual fatigue can be reduced, and the safety accident risk is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile display technology, and in particular to an automobile display screen brightness adjustment system, an adjustment method and an automobile. Background Art

[0002] Existing vehicle screens typically require manual adjustment of brightness, requiring users to frequently adjust screen brightness based on varying ambient lighting conditions. While some vehicles are equipped with automatic brightness adjustment, most are limited to two brightness modes: daytime and nighttime. In environments such as cloudy and rainy days, dusk and dawn, and under the shade of trees, automatic brightness may not effectively adapt. Alternatively, due to frequent changes in ambient light, screen brightness may fluctuate frequently, affecting the driver's viewing experience of the instrument panel and central control screen and potentially causing visual fatigue. Therefore, there is room for improvement. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a system, method and vehicle for adjusting the brightness of a car display screen, so as to solve the technical problem that the brightness adjustment method of the vehicle screen in the prior art cannot effectively adapt to various environments, and when the ambient light changes frequently, the screen brightness frequently jumps.

[0004] To achieve the above and other related objectives, the present invention provides a head-up display height adjustment system, comprising:

[0005] A light sensing unit, used to periodically collect the forward light intensity and longitudinal light intensity of the vehicle;

[0006] a processing unit, configured to calculate and generate corresponding ambient light intensities based on the forward light intensity and the longitudinal light intensity in the same period, perform statistical processing on all the ambient light intensities, and generate corresponding brightness adjustment instructions based on the statistical results;

[0007] The screen control unit is used to adjust the display brightness of multiple vehicle-mounted screens according to the brightness adjustment instruction.

[0008] In one embodiment of the present invention, the processing unit is further configured to determine the brightness range in which the ambient light intensity falls:

[0009] When the number of times that the intensity of multiple consecutive ambient lights is in the same brightness range reaches a first preset number, the preset mapping relationship table is read according to the brightness range to obtain the corresponding screen brightness level and generate a screen brightness adjustment instruction.

[0010] In one embodiment of the present invention, the processing unit is further configured to calculate the change amplitude values ​​of the forward light intensity and the longitudinal light intensity collected in adjacent cycles, and determine the lighting scene in which the vehicle is located based on the change amplitude values;

[0011] The processing unit is further configured to generate a brightness adjustment instruction according to the lighting scene and the statistical result.

[0012] In one embodiment of the present invention, the processing unit is further configured to determine that the vehicle is in a normal lighting scene when the change amplitude value of the forward light intensity is less than or equal to a preset change amplitude threshold value, and / or the change amplitude value of the longitudinal light intensity is less than or equal to the change amplitude threshold value;

[0013] When the change amplitude value of the forward light intensity is greater than the change amplitude threshold, and the change amplitude value of the longitudinal light intensity is greater than the preset change amplitude threshold, it is determined that the vehicle is in a sudden illumination change scene.

[0014] In one embodiment of the present invention, the processing unit is also used to read the mapping relationship table according to the brightness interval when the number of times that multiple consecutive ambient light intensities are in the same brightness interval reaches a second preset number when the car is in a scene of sudden lighting changes, so as to obtain the corresponding screen brightness level and generate a screen brightness adjustment instruction, wherein the second preset number is less than the first preset number.

[0015] In one embodiment of the present invention, the processing unit is further configured to set a tolerance for each brightness interval and determine a retention range for each brightness interval based on the tolerance, wherein the retention range is larger than the brightness interval;

[0016] The processing unit is further configured to obtain a current brightness level of the vehicle-mounted screen and determine whether the current ambient light intensity is within a retention range of a brightness interval corresponding to the current brightness level;

[0017] If yes, the screen control unit controls the vehicle-mounted screen to maintain the current screen brightness level;

[0018] If not, count the other brightness intervals of the current ambient light intensity and determine whether the next ambient light intensity is within the retention range of the brightness interval corresponding to the current brightness level, until the continuous count reaches the first preset number of times, and generate a brightness adjustment instruction.

[0019] In one embodiment of the present invention, the screen control unit is further configured to extract a target brightness level from the brightness adjustment instruction and calculate a brightness level difference between the current brightness level of the vehicle-mounted screen and the target brightness level;

[0020] The screen control unit is further configured to adjust the display brightness of the vehicle-mounted screen step by step according to the brightness level difference until the target brightness level is reached.

[0021] In one embodiment of the present invention, the adjustment system further comprises an eye capture unit, wherein the eye capture unit is configured to detect the viewing direction of the driver's eyes to generate direction information;

[0022] The processing unit is further configured to determine, based on the direction information, whether the driver is viewing the passenger screen in the vehicle-mounted screen;

[0023] If yes, the processing unit continuously times the time the driver views the passenger screen, and generates a brightness reduction instruction when the timer exceeds a preset time threshold;

[0024] The screen control unit is also used to reduce the display brightness of the co-pilot screen according to the brightness reduction instruction.

[0025] The present invention also provides a method for adjusting the brightness of a car display screen, comprising:

[0026] Periodically collect the forward light intensity and longitudinal light intensity of the car;

[0027] According to the forward light intensity and longitudinal light intensity of the same period, the corresponding ambient light intensity is calculated;

[0028] Performing statistical processing on all the ambient light intensities, and generating corresponding brightness adjustment instructions according to the statistical results;

[0029] According to the brightness adjustment instruction, the display brightness of multiple vehicle-mounted screens is adjusted.

[0030] The present invention also provides a car, comprising the car display screen brightness adjustment system as described in any one of the above items.

[0031] As described above, the present invention provides a system, method, and vehicle for adjusting the brightness of a car display screen, which have the following beneficial effects: The present invention utilizes an external ambient light sensor to collect ambient light, eliminating the need for additional internal sensors, thereby reducing the cost of automated equipment. The present invention effectively reduces the frequent fluctuations in screen brightness due to changes in ambient light, and the algorithm is simple and efficient. The present invention adds a counting and filtering mechanism for ambient light levels, which can further reduce visual fatigue. In addition, the present invention also monitors the driver's eye position, and automatically reduces or turns off the brightness of the passenger entertainment screen when the driver is distracted, effectively reducing the risk of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A structural block diagram of a system for adjusting the brightness of a car display screen provided by an embodiment of the present invention;

[0033] Figure 2 A schematic flow chart of a method for adjusting the brightness of a car display screen provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0036] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0037] First, it's important to note that with the continuous advancement of automotive intelligence, vehicles are becoming more than just a means of transportation; they are increasingly becoming a second space for users' leisure and entertainment. As a core component of in-vehicle display and interaction, the role of the car screen is becoming increasingly important. Currently, many new cars feature a multi-screen design, encompassing multiple display interfaces such as the instrument cluster, central control panel, vehicle control panel, passenger screen, streaming rearview mirror, local display, and rear-seat screen. These screens carry different information functions: the instrument cluster, central control panel, and vehicle control panel primarily serve the driver, providing real-time ADAS (Advanced Driver Assistance Systems), navigation, phone calls, and rearview camera information; while the passenger screen and rear-seat screens provide passengers with entertainment, surrounding information, and other services, meeting the needs of different passengers and significantly enhancing the overall vehicle's sense of technology. With the rapid development of intelligent vehicles, in-vehicle displays, as a key medium for human-vehicle interaction, are facing new demands.

[0038] The present invention provides a system and method for adjusting the brightness of an automobile display screen, and an automobile. These systems relate to the field of automobile display technology and can be specifically applied to address the technical issues of existing vehicle screen brightness adjustment methods, which are unable to effectively adapt to various environments and suffer from frequent fluctuations in screen brightness when ambient light changes frequently. This is described in detail below using specific embodiments.

[0039] See also Figure 1 The present invention provides a system for adjusting the brightness of an automobile display screen, which may include: a light sensing unit 10, a processing unit 20, a screen control unit 30, and an on-board screen 40. The light sensing unit 10 is configured to periodically monitor and collect the light intensity outside the vehicle. Specifically, it collects the vehicle's forward and longitudinal light, generating corresponding forward and longitudinal light intensities, respectively. The forward and longitudinal light intensities reflect changes in brightness in different directions outside the vehicle, helping the system understand current lighting conditions in real time. The forward light intensity primarily reflects the light intensity directly in front of the vehicle, while the longitudinal light intensity reflects the effects of lighting on the vehicle's sides. After receiving the forward and longitudinal light intensities over the same period, the processing unit 20 calculates and generates the corresponding ambient light intensity. The ambient light intensity reflects the overall lighting conditions outside the vehicle. The processing unit 20 then performs statistical processing on the ambient light intensity to determine the changing trend of the ambient light intensity. This statistical processing yields a more stable and accurate ambient light intensity, which not only reflects the current instantaneous lighting conditions but also reduces the impact of accidental lighting changes on system judgment. Based on the generated statistical results, the processing unit 20 generates a brightness adjustment instruction, instructing the screen control unit 30 to adjust the brightness of each in-vehicle screen 40. The screen control unit 30 is instructed to extract the target brightness level in the screen brightness adjustment instruction and adjust the display brightness of each in-vehicle screen 40 according to the target brightness level to ensure that the driver and passengers can clearly view the screen content while avoiding visual discomfort caused by excessive or insufficient light. The in-vehicle screens 40 may include but are not limited to the instrument screen, the main driver's screen, the passenger screen, the rear screen, etc.

[0040] In one embodiment of the present invention, the ambient light intensity can be calculated by comprehensively considering the vehicle's forward light intensity and longitudinal light intensity. In this embodiment, the processing unit 20 can select an appropriate algorithm based on the specific lighting conditions, system requirements, and complexity to calculate the generated ambient light intensity. For example, the processing unit 20 uses a weighted average method to calculate the ambient light intensity. Specifically, assuming that the forward light and longitudinal light have different effects on the ambient light intensity, a weighted average can be performed based on the weights of their respective light values ​​to obtain a comprehensive ambient light intensity. Alternatively, the processing unit 20 can also use a maximum value method to calculate the ambient light intensity. That is, assuming that the stronger light source, the forward light or the longitudinal light, has the greatest impact on the ambient light, the maximum value of the two can be selected as the ambient light intensity. In addition, in some scenarios, the relative influence of the forward light and the longitudinal light may change nonlinearly with changes in light intensity. In this case, exponential weighting (e.g., square, cubic, etc.) can be used to increase the influence of the direction with stronger light. In addition, the weights of the forward light and the longitudinal light can be dynamically adjusted by analyzing the changes in the forward light and the longitudinal light in real time. If the forward light changes greatly (for example, entering a tunnel or suddenly encountering strong light), the forward light is given a higher weight; if the longitudinal light changes greatly, the influence of the longitudinal light is dynamically increased.

[0041] Please refer to Table 1, which shows an example mapping relationship between brightness intervals and screen brightness levels. In one embodiment of the present invention, the processing unit 20 first divides the ambient light intensity into multiple brightness intervals and divides the screen display brightness into multiple screen brightness levels. The processing unit 20 then matches the multiple brightness intervals with the multiple screen brightness levels to generate a mapping relationship between the brightness intervals and the screen brightness levels. This assigns different ambient light brightness intervals to different screen brightness levels, ensuring smoother screen brightness adjustment and avoiding the impact of excessive brightness adjustments caused by varying lighting on the driver, thereby reducing visual fatigue. As shown in Table 1, the ambient light intensity is divided into 20 brightness intervals in an ascending order, each representing a specific range of ambient light intensity. For example, the first brightness interval is from 0 lx to 100 lx, the second brightness interval is from 101 lx to 300 lx, and so on. In this embodiment, the range of the brightness intervals increases with the corresponding screen brightness level. The range of the intervals can be calibrated and adjusted according to actual application requirements. This configuration allows different ambient light brightness ranges to correspond to different screen brightness settings, with each ambient light intensity having a corresponding screen brightness setting. The light intensity range within each brightness range is continuous, so when the ambient light intensity changes, the processing unit 20 selects an appropriate screen brightness setting based on the change in ambient light intensity and adjusts the screen brightness accordingly.

[0042] Table 1 - Example of the mapping relationship between screen brightness level and ambient light intensity

[0043]

[0044] In one embodiment of the present invention, the processing unit 20 determines when to adjust the brightness of the vehicle screen 40 by dividing and counting the ambient light intensity into intervals, combined with a specific threshold. The goal of this strategy is to adaptively adjust the screen brightness based on the stability of ambient light changes, rather than reacting to every instantaneous illumination change, thereby improving the stability of the system and user experience. During the statistical process, the processing unit 20 detects the ambient light intensity to determine whether it is in a specific brightness interval. When the ambient light intensity enters a certain brightness interval, the processing unit 20 starts counting; if the ambient light intensity continues to be in this brightness interval, the count increases; if the ambient light intensity changes, causing it to fall into another brightness interval, the count starts again.

[0045] In this embodiment, the ambient light intensity generated by each calculation is recorded and compared with the currently set brightness range. If the ambient light intensity remains unchanged within a brightness range, that is, the sampled values ​​are in the brightness range for multiple consecutive times, the count increases. If the count reaches a preset first preset number of times (for example, 10 times), it is considered that the ambient light condition has stabilized, and the processing unit 10 will adjust the screen brightness according to the gear range. For example, if the ambient light intensity is continuously collected 10 times in the brightness range [0lx, 100lx], the system will trigger the screen brightness adjustment and set the brightness of the vehicle screen 40 to the screen brightness gear 1 corresponding to the brightness range [0lx, 100lx].

[0046] In this embodiment, if the ambient light changes significantly during the counting process, causing the ambient light intensity to enter another brightness range, the count will be reset to 0, that is, the processing unit 20 will restart recording the new ambient light change. For example, if the ambient light intensity changes from the brightness range [0lx, 100lx] to the brightness range [101lx, 300lx], the existing count will be cleared and the count will restart. This mechanism avoids frequent brightness adjustments due to rapid changes in lighting. If the ambient light changes before the brightness adjustment is made, the system will recalculate to ensure that the screen brightness is only adjusted when the lighting conditions are stable.

[0047] The counting filter mechanism described above prevents frequent brightness adjustments due to brief ambient light fluctuations. For example, when a vehicle passes under an overpass, the ambient light intensity will rapidly change from bright to dim and then back to bright. The system will not immediately adjust the brightness. Instead, it will only adjust the brightness when the light fluctuations stabilize and persist for a predetermined number of times. This effectively prevents over-adjustments caused by short-term fluctuations in ambient light.

[0048] It's understandable that ambient light intensity typically fluctuates within different acquisition cycles. Without specific controls, even minor fluctuations in light intensity (e.g., changes of tens of 1x) can trigger the system to readjust the screen brightness. This can lead to frequent screen brightness fluctuations, potentially causing visual fatigue and discomfort to the driver. In one embodiment of the present invention, by setting a tolerance for each brightness interval and dividing the retention range for each brightness interval according to a priority principle, visual fatigue caused by frequent screen brightness fluctuations due to ambient light fluctuations can be further reduced. The tolerance refers to the range within which ambient light intensity can fluctuate without affecting screen brightness adjustment within a certain brightness interval. By setting a reasonable tolerance, frequent screen brightness adjustments due to minor fluctuations in ambient light intensity can be avoided. As shown in Table 1, in this embodiment, by changing the tolerance value distribution method for the gear intervals from the traditional even distribution method to an even difference incremental method, frequent screen brightness fluctuations due to ambient light fluctuations can be effectively reduced. As can be seen, in ambient light measurement and brightness adjustment, the present invention not only considers ambient light stability but also further eliminates frequent brightness adjustments due to minor lighting changes.

[0049] In one embodiment of the present invention, the processing unit 20 is further configured to set a tolerance for each brightness interval and determine a retention range for each brightness interval based on the tolerance, wherein the retention range is greater than the brightness interval. The processing unit 20 is further configured to obtain the current brightness level of the vehicle-mounted screen 40 and determine whether the ambient light intensity is within the retention range of the brightness interval corresponding to the current brightness level; if so, the screen control unit 30 controls the vehicle-mounted screen 40 to maintain the current screen brightness level; if not, the other brightness intervals in which the ambient light intensity is located are counted, and it is determined whether the next ambient light intensity is within the retention range of the brightness interval corresponding to the current brightness level, until the continuous count reaches a first preset number of times, generating a brightness adjustment instruction.

[0050] Specifically, the tolerance of each brightness interval can be set to correspond to the interval range of the brightness interval. In this embodiment, the tolerance can be set to 10% of the interval range, for example. It can be seen that the brightness interval [0lx, 100lx] corresponds to screen brightness level 1, its tolerance is 10lx, and its holding range is [0lx, 110lx]. The holding range means that when the brightness of the vehicle screen 40 is screen brightness level 1, the ambient light intensity can fluctuate between 0lx and 110lx without triggering brightness adjustment. Only when the ambient light intensity exceeds the holding range will the brightness adjustment be performed. The brightness interval [101lx, 300lx] corresponds to screen brightness level 2, its tolerance is 20lx, and its holding range is [81lx, 320lx]. That is, when the brightness of the vehicle screen 40 is screen brightness level 2, the ambient light intensity can fluctuate between 81lx and 320lx without triggering brightness adjustment. The brightness range [301lx, 600lx] corresponds to screen brightness level 3, and its tolerance is 30lx, so its maintenance range is [271lx, 630lx]. That is, when the brightness of the vehicle screen 40 is at screen brightness level 3, the ambient light intensity can fluctuate between 271lx and 630lx without triggering brightness adjustment. By setting the tolerance for each brightness range, the corresponding maintenance range is determined. Only when the ambient light intensity changes exceed the maintenance range of the brightness range will the system readjust the screen brightness. This reduces frequent adjustments caused by slight fluctuations in lighting. The tolerance setting ensures that brightness adjustments do not occur due to slight changes in lighting, thereby effectively avoiding visual fatigue and providing a smoother and more stable driving experience.

[0051] In actual applications, the change in ambient light intensity does not occur instantaneously, but gradually. The present invention further adopts the principle of priority of the interval in which the ambient light is located, aiming to solve the problem of how to reasonably divide the gears when the ambient light intensity fluctuates around the critical value. Simply put, when the ambient light intensity transitions between two gears, the system needs to decide which gear the screen brightness should belong to based on the stability of the illumination. The principle of priority of the interval in which the ambient light is located can ensure that when the ambient light intensity does not change much, the system prioritizes maintaining the current gear and avoids frequent adjustments due to small changes. This priority principle means that when the ambient light intensity approaches the boundary of a brightness interval, if the ambient light intensity fluctuates within the retention range of the current brightness interval (i.e., it is at the edge of the gear), the system will give priority to the screen brightness gear corresponding to the current brightness interval, rather than immediately jumping to another screen brightness gear. The principle of priority of the interval in which the ambient light is located helps to reduce frequent switching between gears and avoid frequent adjustments to the brightness due to small fluctuations in ambient light. For example, the vehicle screen 40 is currently at screen brightness level 2, which corresponds to the brightness interval [101lx, 300lx]. If the processing unit 20 calculates and generates the current ambient light intensity as 90lx, that is, the current ambient light intensity is within the brightness interval [1lx, 100lx], but is still within the retention range [81lx, 320lx] corresponding to the brightness interval [101lx, 300lx]. According to the priority principle of the ambient light interval, when the brightness of the vehicle screen 40 is the screen brightness level corresponding to a certain brightness interval, and the ambient light intensity is within the retention range corresponding to the brightness interval, the system will remain at screen brightness level 2 and will not switch to screen brightness level 1. Only when the ambient light intensity is stabilized at less than 81lx will the processing unit 20 switch to screen brightness level 1. Similarly, the current screen brightness level of the vehicle screen 40 is 2, which corresponds to the brightness range [101lx, 300lx]. If the processing unit 20 calculates and generates the current ambient light intensity as 315lx, it should remain at screen brightness level 2 instead of immediately jumping to screen brightness level 3, because the current ambient light intensity of 315lx is still within the retention range [81lx, 320lx] corresponding to the brightness range [101lx, 300lx].

[0052] In one embodiment of the present invention, in scenarios where lighting changes suddenly, such as entering or exiting a tunnel, driving over a bridge, or experiencing light reflections, the ambient light may suddenly change significantly. In order to ensure that the screen brightness quickly adapts to lighting changes, the system needs to be able to respond quickly to these brightness changes. Otherwise, the screen may maintain an inappropriate brightness for a short period of time, affecting the driver's visual experience. When the ambient light intensity suddenly decreases (for example, when entering a tunnel or a shadow area of ​​a lane) or suddenly increases (such as when walking out of a tunnel or being exposed to strong light), the system will immediately reduce the required count and change the originally required count from the first preset number to the second preset number. The second preset number is less than the first preset number. For example, reducing 10 consecutive counts to 5 times.

[0053] In one embodiment of the present invention, the processing unit 20 can determine the lighting scene in which the car is located, that is, a normal lighting scene or a lighting mutation scene. It can be understood that a lighting mutation usually causes a large fluctuation in the light value, that is, the forward light intensity and the longitudinal light intensity fluctuate greatly. In this embodiment, by setting a change amplitude threshold of the forward light intensity and the longitudinal light intensity, when the change amplitude of the light value exceeds the threshold, it is considered that a lighting mutation has occurred. Specifically, the processing unit 20 can calculate the change amplitude values ​​of the forward light intensity and the longitudinal light intensity collected in adjacent periods; and when the change amplitude of the forward light is greater than the preset change amplitude threshold, and the change amplitude of the longitudinal light intensity is greater than the preset change amplitude threshold, it is judged that the car is in a lighting mutation scene, otherwise, it is a normal lighting scene. For example, if the change amplitude threshold is set to 200lx, if the current forward light intensity is 100lx and the longitudinal light intensity is 130lx; the forward light intensity changes to 500lx and the longitudinal light intensity changes to 480lx at the next moment, then the change amplitude value corresponding to the forward light intensity is 400lx, and the change amplitude value corresponding to the longitudinal light intensity is 350lx. Both change amplitude values ​​exceed the set change amplitude threshold (200lx). At this time, it can be judged as a sudden change in illumination scene.

[0054] Furthermore, the ambient light intensity changes gradually under normal circumstances, but when the illumination suddenly changes, the ambient light intensity will change significantly in a very short period of time. Therefore, it is also possible to identify illumination sudden changes by calculating the rate of illumination change per unit time. First, compare the ambient light intensity collected twice in succession and calculate the difference (i.e., the amount of change). Then, based on the time interval of the collection (for example, light data is collected every 0.1 seconds), calculate the rate of change per unit time. Finally, if the rate of change of the ambient light intensity exceeds the preset rate of change threshold, it is judged as an illumination sudden change.

[0055] Furthermore, when the car enters a scene with sudden changes in lighting, the processing unit 20 will immediately reduce the counting requirement. When the number of times the ambient light intensity is continuously in a brightness range reaches a second preset number, the processing unit 20 can generate a corresponding screen brightness adjustment instruction based on the mapping relationship between the pre-configured screen brightness gear and the ambient light intensity. In this embodiment, the second preset number is less than the first preset number. For example, the original 10 consecutive counts required by the first preset number are reduced to 5 times of the second preset number. The purpose of this design is to enable the system to adapt more quickly in scenes with rapidly changing ambient light, avoid brightness adjustment delays due to excessive counting times, and ensure that the driver obtains a comfortable screen brightness under instantly changing lighting conditions.

[0056] In the absence of sudden changes in ambient light, processing unit 20 follows normal counting and filtering rules. Only when there is a significant change in ambient light does it temporarily adjust the counts for a faster response. This design ensures that brightness adjustment is not overly sensitive and remains stable in stable lighting environments.

[0057] In one embodiment of the present invention, the screen control unit 30 first extracts the target brightness level from the brightness adjustment command. It then calculates the brightness difference between the current brightness level of the vehicle-mounted screen 40 and the target brightness level. Finally, based on this brightness difference, the display brightness of the vehicle-mounted screen 40 is gradually adjusted until the target brightness level is reached. This step-by-step adjustment ensures smooth brightness changes, avoiding eye discomfort caused by sudden brightness changes. It also helps extend the lifespan of the display screen and related electronic components.

[0058] See also Figure 1 In one embodiment of the present invention, the system for adjusting the brightness of a car display screen further includes an eye capture unit 50. The eye capture unit 50 can be used to detect the viewing direction of the driver's eyes and generate direction information. The processing unit 20 can determine whether the driver is watching the co-pilot screen based on the direction information. After determining that the driver is watching the co-pilot screen, the processing unit 20 will time the driver's viewing action and generate a brightness reduction instruction when the duration of the driver watching the co-pilot screen exceeds a preset time threshold. The screen control unit 30 reduces the brightness of the co-pilot screen according to the brightness reduction instruction, or directly turns off the display of the co-pilot screen to avoid safety accidents caused by driver distraction.

[0059] In one embodiment of the present invention, the processing unit 20 can also identify the display content of the co-pilot screen and further refine the control method of the screen brightness according to the display content.

[0060] See also Figure 2The present invention further provides a method for adjusting the brightness of a car display screen, which can be applied to the car display screen brightness adjustment system described in any of the above embodiments and can include the following steps:

[0061] Step S100, periodically collecting the forward light intensity and longitudinal light intensity of the vehicle;

[0062] Step S200: Calculate and generate the corresponding ambient light intensity based on the forward light intensity and the longitudinal light intensity in the same period;

[0063] Step S300: Perform statistical processing on the intensity of all ambient lights and generate corresponding brightness adjustment instructions according to the statistical results;

[0064] Step S400: Adjust the display brightness of multiple vehicle-mounted screens according to the brightness adjustment instruction.

[0065] In one embodiment of the present invention, when step S100 is executed, the vehicle's forward light intensity and longitudinal light intensity are periodically collected. Specifically, the light sensing unit 10 periodically collects the vehicle's forward light and longitudinal light, generating corresponding forward light intensity and longitudinal light intensity, respectively. The forward light intensity and longitudinal light intensity reflect the brightness changes in different directions outside the vehicle, helping the system understand the current lighting conditions in real time. The forward light intensity primarily reflects the light intensity directly in front of the vehicle, while the longitudinal light intensity reflects the lighting effects on the sides of the vehicle.

[0066] In one embodiment of the present invention, when step S200 is executed, the corresponding ambient light intensity is calculated and generated based on the forward light intensity and the longitudinal light intensity of the same period. Specifically, the processing unit 20 can calculate and generate an ambient light intensity after receiving the forward light intensity and the longitudinal light intensity of the same period. The ambient light intensity can reflect the overall lighting conditions of the external environment outside the vehicle. In this embodiment, the processing unit 20 can select a suitable algorithm according to the specific lighting conditions, system requirements and complexity to calculate and generate the ambient light intensity. For example, the processing unit 20 uses a weighted average method to calculate the ambient light intensity. Specifically, assuming that the effects of the forward light and the longitudinal light on the ambient light intensity are different, a weighted average can be performed according to the weights of the respective light values ​​to obtain a comprehensive ambient light intensity. Alternatively, the processing unit 20 can also use the maximum value method to calculate the ambient light intensity, that is, assuming that the stronger light source in the forward light or the longitudinal light has the greatest impact on the ambient light, the maximum value of the two can be selected as the ambient light intensity. In addition, in some scenes, the relative influence of forward and longitudinal light may change nonlinearly with changes in light intensity. In this case, exponential weighting (such as square or cubic) can be used to increase the influence of the direction with stronger light. In addition, the weights of forward and longitudinal light can be dynamically adjusted by analyzing the changes in forward and longitudinal light in real time. If the forward light changes significantly (for example, when entering a tunnel or suddenly encountering strong light), the forward light is given a higher weight; if the longitudinal light changes significantly, the influence of the longitudinal light is dynamically increased.

[0067] In one embodiment of the present invention, when step S300 is executed, all ambient light intensities are statistically processed, and corresponding brightness adjustment instructions are generated based on the statistical results. Specifically, the processing unit 20 determines when to adjust the brightness of the vehicle screen 40 by dividing and counting the ambient light intensity into intervals, combined with a specific threshold. The goal of this strategy is to adaptively adjust the screen brightness according to the stability of ambient light changes, rather than reacting to every instantaneous illumination change, thereby improving the stability of the system and user experience. During the statistical process, the processing unit 20 detects the ambient light intensity and determines whether it is in a specific brightness range. When the ambient light intensity enters a certain brightness range, the processing unit 20 starts counting; if the ambient light intensity continues to be in this brightness range, the count will increase; if the ambient light intensity changes, causing it to fall into another brightness range, the count will start again.

[0068] In this embodiment, the ambient light intensity generated by each calculation is recorded and compared with the currently set brightness interval. If the ambient light intensity remains unchanged within a brightness interval, that is, multiple consecutive sampling values ​​are in this brightness interval, the count increases. If the count reaches a preset first preset number of times (for example, 10 times), it is considered that the ambient light conditions have stabilized, and the processing unit 10 will adjust the screen brightness according to the gear interval. If the ambient light changes significantly during the counting process, causing the ambient light intensity to enter other brightness intervals, the count will be reset to 0, that is, the processing unit 20 will start recording new ambient light changes again. This mechanism avoids frequent brightness adjustments due to rapid changes in lighting. If the ambient light changes before the brightness adjustment is made, the system will recalculate to ensure that the screen brightness is only adjusted when the lighting conditions are stable.

[0069] In one embodiment of the present invention, when step S400 is executed, the display brightness of multiple in-vehicle screens is adjusted according to the brightness adjustment instruction. Specifically, the screen control unit 30 first extracts the target brightness level from the brightness adjustment instruction. Then, the brightness level difference between the current brightness level of the in-vehicle screen 40 and the target brightness level is calculated. Finally, based on the brightness level difference, the display brightness of the in-vehicle screen 40 is adjusted step by step until the target brightness level is reached.

[0070] The present invention also provides a car, which is equipped with the car display screen brightness adjustment system described in any one of the above embodiments.

[0071] In summary, the present invention provides a system and method for adjusting the brightness of an automobile display screen, and an automobile. These methods relate to the field of automobile display technology and can be used to address the technical issues of prior art vehicle screen brightness adjustment methods, which are unable to effectively adapt to various environments and suffer from frequent fluctuations in screen brightness when ambient light changes frequently. The present invention utilizes an external ambient light sensor to collect ambient light, eliminating the need for additional internal sensors, thereby reducing the cost of automated equipment. Furthermore, by adjusting the tolerance distribution method for brightness intervals, the present invention replaces the traditional average distribution method with an average difference increment method, effectively reducing the frequent fluctuations in screen brightness with ambient light changes. This has the advantages of a simple and efficient algorithm. Furthermore, the present invention incorporates a counting and filtering mechanism for ambient light levels. When the light level stabilizes at a certain level, the screen brightness is adjusted to the corresponding value. Even occasional changes in ambient light do not immediately trigger screen brightness adjustments, further reducing visual fatigue. Furthermore, the present invention monitors the driver's eye position and automatically reduces or disables the passenger entertainment screen's brightness if it detects that the video playing on the passenger entertainment screen may distract the driver, effectively reducing the risk of safety accidents. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial application value.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A system for adjusting the brightness of a car display screen, characterized in that: include: A light sensing unit, used for periodically collecting the forward light intensity and longitudinal light intensity of the vehicle; A processing unit, used to calculate and generate the corresponding ambient light intensity according to the forward light intensity and the longitudinal light intensity of the same period, perform statistical processing on all the ambient light intensities, and generate corresponding brightness adjustment instructions according to the statistical results; The screen control unit is used to adjust the display brightness of multiple vehicle-mounted screens according to the brightness adjustment instruction.

2. The automobile display screen brightness adjustment system according to claim 1, characterized in that: The processing unit is further configured to determine the brightness interval of the ambient light intensity: When the number of times that a plurality of consecutive ambient light intensities are in the same brightness interval reaches a first preset number, a preset mapping relationship table is read according to the brightness interval to obtain a corresponding screen brightness level, and a screen brightness adjustment instruction is generated.

3. The automobile display screen brightness adjustment system according to claim 2, characterized in that: The processing unit is also used to calculate the change amplitude values ​​of the forward light intensity and the longitudinal light intensity collected in adjacent cycles, and determine the lighting scene where the car is located according to the change amplitude values; The processing unit is further configured to generate a brightness adjustment instruction according to the lighting scene and the statistical result.

4. The automobile display screen brightness adjustment system according to claim 3, characterized in that: The processing unit is further configured to determine that the vehicle is in a normal lighting scene when the change amplitude value of the forward light intensity is less than or equal to a preset change amplitude threshold value, and / or the change amplitude value of the longitudinal light intensity is less than or equal to the change amplitude threshold value; When the change amplitude value of the forward light intensity is greater than the change amplitude threshold, and the change amplitude value of the longitudinal light intensity is greater than the preset change amplitude threshold, it is determined that the vehicle is in a sudden illumination change scene.

5. The system for adjusting the brightness of a car display screen according to claim 4, characterized in that: The processing unit is also used to read the mapping relationship table according to the brightness interval to obtain the corresponding screen brightness level and generate a screen brightness adjustment instruction when the number of times that multiple consecutive ambient light intensities are in the same brightness interval reaches a second preset number when the automobile is in a scene of sudden lighting changes, wherein the second preset number is less than the first preset number.

6. The automobile display screen brightness adjustment system according to claim 2, characterized in that: The processing unit is further used to set a tolerance for each brightness interval, and determine a retention range for each brightness interval according to the tolerance, wherein the retention range is larger than the brightness interval; The processing unit is also used to obtain the current brightness level of the vehicle-mounted screen, and determine whether the current ambient light intensity is within the retention range of the brightness interval corresponding to the current brightness level; If yes, the screen control unit controls the vehicle-mounted screen to maintain the current screen brightness level; If not, count the other brightness intervals of the current ambient light intensity, and determine whether the next ambient light intensity is within the retention range of the brightness interval corresponding to the current brightness level, until the continuous count reaches the first preset number of times, and generate a brightness adjustment instruction.

7. The automobile display screen brightness adjustment system according to claim 1, characterized in that: The screen control unit is also used to extract a target brightness level from the brightness adjustment instruction, and calculate a brightness level difference between a current brightness level of the vehicle-mounted screen and the target brightness level; The screen control unit is also used to adjust the display brightness of the vehicle-mounted screen step by step according to the brightness level difference until the target brightness level is reached.

8. The automobile display screen brightness adjustment system according to claim 1, characterized in that: The adjustment system further includes an eyeball capture unit, which is used to detect the viewing direction of the driver's eyes to generate direction information; The processing unit is further used to determine whether the driver is viewing the co-pilot screen in the vehicle-mounted screen according to the direction information; If yes, the processing unit continuously times the driver viewing the co-pilot screen, and generates a brightness reduction instruction when the timing exceeds a preset time threshold; The screen control unit is also used to reduce the display brightness of the co-pilot screen according to the brightness reduction instruction.

9. A method for adjusting the brightness of a car display screen, characterized in that: include: Periodically collect the forward light intensity and longitudinal light intensity of the car; According to the forward light intensity and longitudinal light intensity of the same period, the corresponding ambient light intensity is calculated and generated; Performing statistical processing on the intensity of all the ambient light, and generating corresponding brightness adjustment instructions according to the statistical results; According to the brightness adjustment instruction, the display brightness of multiple vehicle-mounted screens is adjusted.

10. An automobile, characterized in that: The automobile comprises a system for adjusting the brightness of an automobile display screen as described in any one of claims 1-8.

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