Head-up display device brightness adjustment system for a vehicle and vehicle

Abstract

The application provides a head-up display device brightness adjusting system of a vehicle and the vehicle. The head-up display device brightness adjusting system comprises a main control unit and an ambient light sensor arranged at a front position of the vehicle. The main control unit is configured to receive a sensing signal of the ambient light sensor and receive a clearance lamp state signal and a high beam state signal of the vehicle. According to the intensity value of the sensing signal of the ambient light sensor and the clearance lamp and high beam state signals of the vehicle, a corresponding brightness adjusting signal is generated to adjust the display brightness of the head-up display device. When the clearance lamp state signal and the high beam state signal of the vehicle are both not turned on, the main control unit determines the upper limit value and the lower limit value of the display brightness of the head-up display device based on a first mapping data set. The application can improve the comfort and safety of the vehicle and the running stability of the head-up display device of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of head-up display devices, and more specifically to a head-up display brightness adjustment system for a vehicle and the vehicle thereof. Background Technology

[0002] With the increasing popularity of in-vehicle head-up displays (HUDs), how to accurately adjust the brightness of in-vehicle head-up displays according to the ambient light to avoid visual fatigue or momentary blindness for drivers and passengers has become one of the core requirements of human-computer interaction.

[0003] Traditional dimming methods rely on a single light sensor, which does not take into account the situation when the driver turns on the high beams at night or waits for the headlights in front of the vehicle. Because the light sensor cannot effectively collect the light projected forward by the headlights, the HUD display cannot change accordingly. As a result, the driver will perceive that the HUD image is darker, blurry, or out of focus, which will have a significant impact on driving safety.

[0004] Meanwhile, due to the limited computing power of automotive-grade control units, how to achieve smooth dimming with sufficient dimming accuracy under limited computing resources is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a head-up display brightness adjustment system for a vehicle and a vehicle.

[0006] The vehicle's head-up display brightness adjustment system includes:

[0007] A main control unit; an ambient light sensor installed at the forward position of the vehicle; the main control unit is configured to: receive the sensing signal from the ambient light sensor, and receive the vehicle's parking light status signal and high beam status signal; generate a corresponding brightness adjustment signal based on the intensity value of the sensing signal from the ambient light sensor and the vehicle's parking light and high beam status signals, and adjust the display brightness of the head-up display device; wherein, when the vehicle's parking light status signal and high beam status signal indicate that both the parking lights and high beams are off, the main control unit determines the upper and lower limits of the display brightness of the head-up display device based on a first mapping dataset; when the vehicle's parking light status signal and high beam status signal indicate that the parking lights are on and the high beams are off, the main control unit determines the upper and lower limits of the display brightness of the head-up display device based on a second mapping dataset; when the vehicle's parking light status signal and high beam status signal indicate that the high beams are on, the main control unit determines the upper and lower limits of the display brightness of the head-up display device based on a third mapping dataset.

[0008] According to one embodiment of this application, the first mapping dataset, the second mapping dataset, and the third mapping dataset include mapping data between the intensity value of the sensing signal of the ambient light sensor and the duty cycle parameters of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device.

[0009] According to one embodiment of this application, the intensity value of the sensing signal of the ambient light sensor sequentially includes an initial intensity value range, an intermediate intensity value range, and a tail intensity value range; the boundary between the initial intensity value range and the intermediate intensity value range is a daytime ambient light setting value; the boundary between the intermediate intensity value range and the tail intensity value range is a direct ambient light setting value.

[0010] According to one embodiment of this application, the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the first mapping dataset; the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the third mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset.

[0011] According to one embodiment of this application, the difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval of the third mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval of the second mapping dataset is greater than the difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval of the second mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval of the first mapping dataset.

[0012] According to one embodiment of this application, the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval of the second mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval of the first mapping dataset; the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval of the third mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval of the second mapping dataset.

[0013] According to one embodiment of this application, the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value interval of the second mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value interval of the first mapping dataset; the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value interval of the third mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value interval of the second mapping dataset.

[0014] According to one embodiment of this application, in the first mapping dataset, the second mapping dataset, and the third mapping dataset, the difference in duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval is greater than the difference in duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval; the difference in duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval is greater than the difference in duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value interval.

[0015] According to one embodiment of this application, the main control unit is further configured to: process the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device through an integer coefficient digital filter, and then transmit them to the light source driving module of the head-up display device.

[0016] According to one embodiment of this application, the main control unit is further configured to: store and accumulate the remainder of the integer coefficient digital filter when the head-up display device displays consecutive frames; when the accumulated value of the remainder of the integer coefficient digital filter corresponding to the consecutive frames exceeds the divisor value of the integer coefficient digital filter of the current frame, add the brightness compensation value corresponding to the accumulated value of the remainder to the display brightness value of the next frame of the current frame.

[0017] According to one embodiment of this application, the main control unit is further configured to: clear the accumulated value of the remainder of the integer coefficient digital filter to zero and restart the accumulation process.

[0018] According to one embodiment of this application, when the intensity value of the sensing signal of the ambient light sensor increases from the initial intensity value range or the intermediate intensity value range, the integer coefficient digital filter has a first filtering time constant; when the intensity value of the sensing signal of the ambient light sensor decreases from the intermediate intensity value range or the tail intensity value range, the integer coefficient digital filter has a second filtering time constant; wherein, the first filtering time constant and the second filtering time constant are in a multiple relationship, and the multiple value is a rational number.

[0019] According to one embodiment of this application, the digital filter includes a first-order infinite impulse response filter or a first-order Butterworth filter.

[0020] According to one embodiment of this application, the light source driving module is connected to the backlight of the head-up display device.

[0021] According to one embodiment of this application, the brightness adjustment signal is obtained based on the upper and lower limits of the display brightness of the head-up display device and a brightness ratio setting value.

[0022] According to one embodiment of this application, the ambient light sensor is installed in the front windshield area or the front cover area of ​​the vehicle.

[0023] According to one embodiment of this application, the main control unit is located in the head-up display device or in the domain controller or area controller of the vehicle.

[0024] This application also provides a vehicle including a head-up display brightness adjustment system for any of the preceding claims.

[0025] The technical solution of this application can adapt to changes in light brightness caused by various road conditions and changes in the vehicle's surrounding environment, and adjust the imaging brightness of the vehicle's head-up display device to minimize visual discomfort to the driver and the impact on vehicle handling safety, thereby improving the comfort and safety of the vehicle and the operational stability of the vehicle's head-up display device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The following drawings are not intentionally drawn to scale to actual size; their focus is on illustrating the main points of the present invention.

[0027] Figure 1 This is a schematic diagram of a head-up display brightness adjustment system for a vehicle according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of a head-up display brightness adjustment system for a vehicle according to another embodiment of this application;

[0029] Figure 3 This is a schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of the present invention.

[0031] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0032] While this application makes various references to certain modules of the systems according to embodiments of this application, any number of different modules can be used and run on user terminals and / or servers. The modules described are merely illustrative, and different aspects of the systems and methods may use different modules.

[0033] This application describes a head-up display brightness adjustment system for a vehicle and a vehicle including the system.

[0034] Figure 1 This is a schematic diagram of the composition of a head-up display brightness adjustment system for a vehicle according to an embodiment of this application.

[0035] refer to Figure 1The head-up display brightness adjustment system 100 of the vehicle includes a main control unit 111 and an ambient light sensor 112.

[0036] In some embodiments, the ambient light sensor 112 is installed in the front windshield area 101 or the hood area 115 of the vehicle.

[0037] exist Figure 1 The head-up display 102 in the vehicle has an imaging area, for example, 104, which is located in the driver D's field of vision. If the head-up display is a panoramic head-up display 103, its imaging area is, for example, 105.

[0038] In some embodiments, the main control unit 111 and the ambient light sensor 112 are connected via a CAN bus 121 or a LIN bus 122. The status signals of the vehicle's parking lights (or position lights) 114 and the high beam lights 113 can also be transmitted via the CAN bus 121.

[0039] In some embodiments, the main control unit 111 is configured to: receive a sensing signal from the ambient light sensor 112, and receive a status signal of the vehicle's side marker lights and a status signal of the high beam lights; generate a corresponding brightness adjustment signal based on the intensity value of the sensing signal from the ambient light sensor 112 and the status signals of the vehicle's side marker lights and high beam lights, and adjust the display brightness of the head-up display device.

[0040] In some embodiments, when the vehicle's side marker lights status signal and high beam status signal indicate that neither the side marker lights nor the high beams are turned on, the main control unit 111 determines the upper and lower limits of the display brightness of the head-up display device based on the first mapping dataset.

[0041] When the vehicle's side marker light status signal and high beam status signal indicate that the side marker lights are on but the high beams are off, the main control unit 111 determines the upper and lower limits of the head-up display device's display brightness based on the second mapping dataset.

[0042] When the vehicle's side marker light status signal and high beam status signal indicate that the vehicle's high beam is on, the main control unit 111 determines the upper and lower limits of the head-up display device's display brightness based on the third mapping dataset.

[0043] In some embodiments, the first mapping dataset, the second mapping dataset, and the third mapping dataset include mapping data between the intensity value of the sensing signal of the ambient light sensor 112 and the duty cycle parameters of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device.

[0044] In some embodiments, the intensity values ​​of the sensing signal of the ambient light sensor 112 sequentially include an initial intensity value range, an intermediate intensity value range, and a tail intensity value range; the boundary between the initial intensity value range and the intermediate intensity value range is the daytime ambient light setting value; and the boundary between the intermediate intensity value range and the tail intensity value range is the direct ambient light setting value.

[0045] The intensity value of the sensing signal of the ambient light sensor 112 is, for example, measured in lux (Lux or Lx). One lux (Lux) is equal to one lumen (Lm) of light uniformly distributed per square meter, i.e., 1 Lm / m. 2 A higher value indicates a brighter environment or object surface.

[0046] The daytime ambient light setting can be set according to the natural environment or the geographical lighting conditions of the area, such as 4000 Lux, 5000 Lux, 6000 Lux, etc. The calibration conditions of the ambient light sensor 112 can also be considered. The direct ambient light setting can also be set according to natural environmental conditions, such as 10000 Lux, 12000 Lux, etc. In one embodiment, the intensity value of the sensing signal of the ambient light sensor 112 includes an initial intensity value range of (0-5000 Lux), an intermediate intensity value range of (5000-12000 Lux), and a tail intensity value range of (12000-50000 Lux). In another embodiment, the intensity value of the sensing signal of the ambient light sensor 112 includes an initial intensity value range of (0-4000 Lux), an intermediate intensity value range of (4000-12000 Lux), and a tail intensity value range of (12000-60000 Lux). The right boundary of the tail strength value range can be set according to requirements or actual computing resource conditions; this is just an example.

[0047] In some embodiments, the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the first mapping dataset. Similarly, the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the third mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset.

[0048] In some embodiments, the difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the third mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset is greater than the difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the first mapping dataset.

[0049] In some embodiments, the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the second mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the first mapping dataset.

[0050] The duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the third mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the second mapping dataset.

[0051] In some embodiments, the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the second mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the first mapping dataset.

[0052] The duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the third mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the second mapping dataset.

[0053] During vehicle operation, changes in road lighting conditions, headlight switching, and entering / exiting tunnels cause variations in light intensity. In dimly lit environments (where the intensity value of the ambient light sensor 112 is within its initial intensity range), the human eye's pupils are dilated and extremely sensitive to light. Even minute changes in ambient light require the head-up display device to significantly adjust the duty cycle parameter of the pulse width modulation signal corresponding to the display brightness to minimize eye stimulation. When light intensity increases to daylight levels due to a combination of factors, the human eye enters a photopic vision state, and the relative weight of the absolute increase in ambient light on eye stimulation decreases significantly.

[0054] The technical solution of this application can adapt to the changes in light brightness caused by various road conditions and adjust the brightness of the vehicle's head-up display device to minimize visual discomfort to the driver and the impact on vehicle handling safety.

[0055] Meanwhile, in this application's solution, under high illumination conditions achieved by the superposition of multiple factors (such as direct ambient light settings), including high illumination conditions formed by pure natural light or high illumination conditions formed by the superposition of dim natural light and high beams, the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the head-up display device's display brightness converge to the same order of magnitude. This adjustment method is more consistent with actual scenarios. Furthermore, this solution can reduce the risk of overheating and malfunction of the vehicle's head-up display device.

[0056] In some embodiments, in the first mapping dataset, the second mapping dataset, and the third mapping dataset, the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped in the intermediate intensity value range is greater than the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped in the initial intensity value range.

[0057] The difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range is greater than the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range.

[0058] This application solution ensures the effectiveness of adjusting the brightness of the head-up display device while providing users with greater room for adjustable light, adapting to the usage needs of different users.

[0059] In some embodiments, the brightness adjustment signal is obtained based on the upper and lower limits of the display brightness of the head-up display device and a brightness ratio setting value. For example, the brightness adjustment signal is obtained based on the lower limit of the display brightness of the head-up display device, the difference between the upper and lower limits of the display brightness of the head-up display device, and a brightness ratio setting value (e.g., 40%, 50%, or 60%).

[0060] In some embodiments, the main control unit 111 is further configured to: process the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device through an integer coefficient digital filter, and then transmit them to the light source driving module of the head-up display device. The light source driving module is connected to the backlight of the head-up display device. The backlight of the head-up display device includes, for example, LED lights.

[0061] In some embodiments, the main control unit 111 is further configured to: store and accumulate the remainder of the integer coefficient digital filter when the head-up display device displays consecutive frames; when the accumulated value of the remainder of the integer coefficient digital filter corresponding to the consecutive frames exceeds the divisor value of the integer coefficient digital filter of the current frame, add the brightness compensation value corresponding to the accumulated value of the remainder to the display brightness value of the next frame of the current frame.

[0062] In some embodiments, the main control unit 111 is further configured to: clear the accumulated value of the remainder of the integer coefficient digital filter to zero and restart the accumulation process.

[0063] In some embodiments, the digital filter includes a first-order infinite impulse response filter or a first-order Butterworth filter, or other types of digital filters.

[0064] This application's solution enables brightness adjustment of the head-up display device under integer calculation conditions, effectively reducing the consumption of onboard computing resources, such as the computing and transmission resource consumption caused by floating-point calculations. Furthermore, this solution also ensures the effectiveness and stability of brightness adjustment under integer calculation conditions through multi-frame compensation.

[0065] In some embodiments, when the intensity value of the sensing signal of the ambient light sensor 112 increases from the initial intensity value range or the intermediate intensity value range, the integer coefficient digital filter has a first filtering time constant; when the intensity value of the sensing signal of the ambient light sensor 112 decreases from the intermediate intensity value range or the tail intensity value range, the integer coefficient digital filter has a second filtering time constant.

[0066] The first and second filtering time constants are in a multiple relationship, and this multiple is a rational number. For example, this multiple could be 2, 3, 5, 7, or 8.5 times. By setting the first and second filtering time constants at a high ratio, this application's solution can further regulate the rate of light adjustment based on the trend of light adjustment when the change in the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the head-up display's brightness is transmitted to the light source driving module. During the adjustment corresponding to an increase in brightness (i.e., when the intensity value of the sensing signal from the ambient light sensor 112 increases), the rate of brightness increase of the head-up display is slowed down, preventing sudden stimulation of the human eye by the abrupt increase in brightness of the head-up display and allowing sufficient physiological adaptation time for pupil contraction. During the adjustment corresponding to a decrease in brightness (i.e., when the intensity value of the sensing signal from the ambient light sensor 112 decreases), the brightness of the head-up display decreases at a relatively fast rate, thereby quickly adjusting to a visually safe range and maximizing the protection of the driver's night vision.

[0067] In one embodiment, after formal transformation, the digital filter can be expressed as, for example, Y(t) = [ U(t) + C Y(t-1) ] / ( C+1 ).

[0068] Where Y(t) is the current frame output value corresponding to the duty cycle parameter of the pulse width modulation signal of the head-up display device after signal format conversion and / or intensity value conversion, U(t) is the target output value, Y(t-1) is the output value of the previous frame, and C is the filtering time constant. t is the signal ordinal number or signal frame number obtained based on the conversion of time physical quantities. Physical time constant τ=C T m T m For the signal period. Before the expression conversion, the digital filter's expression form is, for example, as follows: y [n] = α x [n] + (1 - α ) y [n-1]), where, then α represents the filter coefficients, with values ​​ranging from (0, 1). n represents the signal ordinal number or signal frame number.

[0069] In some embodiments, the main control unit 111 is located in the head-up display device. In other embodiments, such as Figure 2As shown, the main control unit 111 is located in the vehicle's domain controller or zone controller module 201. Alternatively, the main control unit 111 can also be located in the vehicle control unit (VCU) module.

[0070] This application also provides a vehicle including the aforementioned head-up display brightness adjustment system.

[0071] Figure 3 This is a schematic diagram of a vehicle 300, which includes, for example, a head-up display brightness adjustment system 100. In other embodiments, the vehicle may also include a head-up display brightness adjustment system 200.

[0072] The head-up display brightness adjustment system and vehicle of this application can effectively and stably adjust the brightness of the vehicle's head-up display without adding additional sensors or equipment, i.e. under limited hardware resources, greatly enhancing the environmental adaptability and user-friendly characteristics of the vehicle's head-up display brightness, thereby improving the safety of vehicle operation.

[0073] This solution eliminates the need for additional sensors on the dashboard, inside or outside the vehicle cabin to monitor the surrounding environment or driver status, and avoids the resulting additional computational requirements. Furthermore, this solution prevents overheating of the vehicle's head-up display (HUD) due to overcompensation and the resulting malfunctions, thus enhancing the operational stability and durability of the HUD.

[0074] This application uses specific terms to describe embodiments of the application. Terms such as "first / second embodiment," "an embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0075] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in a common dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as being interpreted in an idealized or highly formalized sense, unless expressly defined herein.

[0076] The foregoing description is illustrative of the invention and should not be construed as limiting it. Although several exemplary embodiments of the invention have been described, those skilled in the art will readily understand that many modifications can be made to the exemplary embodiments without departing from the novel teachings and advantages of the invention. Therefore, all such modifications are intended to be included within the scope of the invention as defined in the claims. It should be understood that the foregoing description is illustrative of the invention and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.

Claims

1. A brightness adjustment system for a vehicle's head-up display, characterized in that, include: Main control unit; An ambient light sensor is installed at the front position of the vehicle; The main control unit is configured as follows: It receives the sensing signal from the ambient light sensor, and also receives the status signals of the vehicle's side marker lights and high beam lights. Based on the intensity value of the sensing signal from the ambient light sensor and the status signals of the vehicle's side marker lights and high beams, a corresponding brightness adjustment signal is generated to adjust the display brightness of the head-up display device. Specifically, when the vehicle's side marker lights status signal and high beam status signal indicate that neither the side marker lights nor the high beams are turned on, the main control unit determines the upper and lower limits of the head-up display device's display brightness based on the first mapping dataset. When the vehicle's side marker light status signal and high beam status signal indicate that the side marker lights are on and the high beams are off, the main control unit determines the upper and lower limits of the display brightness of the head-up display device based on the second mapping dataset. When the vehicle's position light status signal and high beam status signal indicate that the vehicle's high beam is on, the main control unit determines the upper and lower limits of the head-up display device's display brightness based on the third mapping dataset.

2. The brightness adjustment system for a vehicle's head-up display device according to claim 1, characterized in that, The first mapping dataset, the second mapping dataset, and the third mapping dataset include mapping data between the intensity value of the sensing signal of the ambient light sensor and the duty cycle parameters of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device.

3. The brightness adjustment system for a vehicle's head-up display device according to claim 2, characterized in that, The intensity values ​​of the sensing signal from the ambient light sensor sequentially include an initial intensity value range, a middle intensity value range, and a tail intensity value range. The boundary between the initial intensity value range and the intermediate intensity value range is the daytime ambient light setting value; the boundary between the intermediate intensity value range and the tail intensity value range is the direct ambient light setting value.

4. The brightness adjustment system for a vehicle's head-up display device according to claim 3, characterized in that, The duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the first mapping dataset. The duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the third mapping dataset is greater than the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset.

5. The brightness adjustment system for a vehicle's head-up display device according to claim 4, characterized in that, The difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the third mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset is greater than the difference between the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the second mapping dataset and the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value range of the first mapping dataset.

6. The brightness adjustment system for a vehicle's head-up display according to claim 3, characterized in that, The duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the second mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the first mapping dataset. The duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the third mapping dataset are equal to the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range of the second mapping dataset.

7. The brightness adjustment system for a vehicle's head-up display according to claim 3, characterized in that, The duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the second mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the first mapping dataset. The duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the third mapping dataset is equal to the duty cycle parameter of the pulse width modulation signal corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range of the second mapping dataset.

8. The brightness adjustment system for a vehicle's head-up display device according to claim 3, characterized in that, In the first mapping dataset, the second mapping dataset, and the third mapping dataset, the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value interval is greater than the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the initial intensity value interval. The difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the intermediate intensity value range is greater than the difference between the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device mapped by the tail intensity value range.

9. The brightness adjustment system for a vehicle's head-up display device according to claim 2, characterized in that, The main control unit is further configured to: process the duty cycle parameters of the pulse width modulation signals corresponding to the upper and lower limits of the display brightness of the head-up display device through an integer coefficient digital filter and then transmit them to the light source driving module of the head-up display device.

10. The brightness adjustment system for a vehicle head-up display according to claim 9, characterized in that, The main control unit is further configured to: store and accumulate the remainder of the integer coefficient digital filter when the head-up display device displays continuous frames; When the accumulated value of the remainder of the integer coefficient digital filter corresponding to the consecutive frames exceeds the divisor value of the integer coefficient digital filter of the current frame, the brightness compensation value corresponding to the accumulated value of the remainder is superimposed on the display brightness value of the next frame of the current frame.

11. The brightness adjustment system for a vehicle's head-up display according to claim 10, characterized in that, The main control unit is also configured to: The accumulated value of the remainder of the integer coefficient digital filter is cleared to zero and the accumulation process is restarted.

12. The brightness adjustment system for a vehicle head-up display according to claim 9, characterized in that, When the intensity value of the sensing signal of the ambient light sensor increases from the initial intensity value range or the intermediate intensity value range, the integer coefficient digital filter has a first filtering time constant; When the intensity value of the sensing signal from the ambient light sensor decreases from the middle intensity value range or the tail intensity value range, the integer coefficient digital filter has a second filtering time constant. Among them, the first filter time constant and the second filter time constant are in a multiple relationship, and the multiple value is a rational number.

13. The brightness adjustment system for a vehicle's head-up display according to claim 9, characterized in that, The integer coefficient digital filter includes a first-order infinite impulse response filter or a first-order Butterworth filter.

14. The brightness adjustment system for a vehicle head-up display according to claim 9, characterized in that, The light source driving module is connected to the backlight of the head-up display device.

15. The brightness adjustment system for a vehicle's head-up display according to claim 1, characterized in that, The brightness adjustment signal is obtained based on the upper and lower limits of the display brightness of the head-up display device and the brightness ratio setting value.

16. The brightness adjustment system for a vehicle's head-up display according to claim 1, characterized in that, The ambient light sensor is installed in the front windshield area or the front hood area of ​​the vehicle.

17. The brightness adjustment system for a vehicle's head-up display according to claim 1, characterized in that, The main control unit is located in the head-up display device or in the vehicle's domain controller or area controller.

18. A vehicle, characterized in that, The brightness adjustment system for the head-up display of a vehicle as described in any one of claims 1-17.

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