HUD brightness automatic adjusting system and method
By combining ambient light acquisition and temperature detection with an automatic adjustment mode, the problem of cumbersome and inaccurate HUD brightness adjustment has been solved, achieving intelligent adjustment and temperature protection, thus improving driving safety and user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-03
- Publication Date
- 2026-04-10
AI Technical Summary
Existing HUD brightness adjustment methods are cumbersome and imprecise, especially when the ambient light changes drastically, the adjustment is not smooth, there is a lack of mechanisms to deal with abnormal situations, and they are easily damaged at high temperatures and have no memory function, which affects driving safety and user experience.
It employs an ambient light acquisition module, a manual adjustment module, a control module, a memory module, a temperature detection module, and an output module. Combining automatic and manual adjustment modes, it achieves intelligent adjustment by utilizing ambient light acquisition data and temperature detection, and is equipped with temperature protection and memory functions.
It achieves intelligent adaptive adjustment of HUD brightness, improving driving safety and user experience, avoiding damage from high temperatures, and providing a memory function to ensure smooth and precise adjustment when ambient light changes.
Smart Images
Figure CN121838690A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automotive electronics technology, specifically to a HUD brightness automatic adjustment system and method. Background Technology
[0002] Currently, HUDs, as an important display device in automobiles, offer various brightness adjustment methods. Some HUDs rely solely on manual adjustment, requiring drivers to frequently operate them according to changes in ambient light; others have automatic adjustment functions, but their adjustment logic is simple.
[0003] Traditional HUD brightness adjustment has many problems. Manual adjustment is cumbersome, distracts the driver, and affects driving safety. Automatic HUDs are not smooth and precise enough when the ambient light changes drastically, and lack a mechanism to deal with abnormal ambient light data. At the same time, most HUDs do not have temperature protection functions, are easily damaged at high temperatures, and do not have memory functions, requiring brightness to be readjusted every time they are turned on, resulting in a poor user experience. Summary of the Invention
[0004] The purpose of this invention is to provide a HUD brightness automatic adjustment system and method to solve the problems in the prior art.
[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:
[0006] A head-up display (HUD) brightness automatic adjustment system includes an ambient light acquisition module, a manual adjustment module, a control module, a memory module, a temperature detection module, and an output module. The control module is electrically connected to the ambient light acquisition module, the manual adjustment module, the memory module, the temperature detection module, and the output module. The ambient light acquisition module and the control module are used to acquire data related to sunlight intensity and ambient light intensity. The manual adjustment module and the control module are used to receive brightness adjustment commands from the user at different levels. The memory module and the control module are used to store the brightness level at the last power-off. The temperature detection module and the control module are used to detect the internal temperature of the HUD. The output module and the control module are used to output pulse width modulation signals to control the backlight brightness.
[0007] Based on a preferred scheme provided by a HUD brightness automatic adjustment system, when the ambient light acquisition module acquires ambient light intensity related data, it takes the average value of the ambient light illuminance within 3 seconds. If the change range exceeds 30,000 lux, it takes the previous value and then takes the average value.
[0008] Based on a preferred solution provided by a HUD brightness automatic adjustment system, the preset strategy of the control module includes an automatic mode and a manual mode. In the automatic mode, the adjustment level of the manual mode is combined with the ambient light brightness for adaptive adjustment. When the control module does not receive valid ambient light data and the user makes adjustments, it automatically switches to the manual mode.
[0009] Based on a preferred solution provided by a HUD brightness automatic adjustment system, the following conditions must be met to activate the automatic mode: the HUD display is normal and the control module receives the ambient light brightness and automatic adjustment start signal received by the ambient light acquisition module.
[0010] Based on a preferred embodiment of an automatic brightness adjustment system for a head-up display (HUD), when the temperature detection module detects that the internal temperature of the HUD is ≥75℃, the control module controls the HUD panel to reduce its brightness; when the temperature detection module detects that the internal temperature of the HUD is ≥95℃, the control module controls and turns off the HUD; when the temperature detection module detects that the internal temperature of the HUD has recovered to 85℃, the control module controls the HUD to automatically turn on.
[0011] Based on a preferred scheme provided by a HUD brightness automatic adjustment system, in automatic adjustment mode, the manual adjustment brightness pulse width modulation value = A × the currently calibrated maximum brightness pulse width modulation + B, where A is the coefficient corresponding to different brightness levels, B is the calibration value, and the lower limit of pulse width modulation is 0.2%.
[0012] Based on a preferred embodiment of a HUD brightness automatic adjustment system, a verification module is further included. The verification module is electrically connected to the output module and is used to verify whether the brightness corresponding to the pulse width modulation signal output by the output module meets expectations. If it does not meet expectations, the output module can adjust the brightness.
[0013] A method for automatically adjusting the brightness of a HUD includes the following steps:
[0014] S1. The ambient light acquisition module collects data related to ambient light intensity.
[0015] S2. The manual adjustment module receives different levels of brightness adjustment commands input by the user;
[0016] S3. The control module controls the brightness adjustment of the HUD according to the ambient light data and adjustment instructions, and adjusts the brightness of the HUD according to the preset strategy. The automatic mode is based on the adjustment level of the manual mode and combines the ambient light brightness for adaptive adjustment. When no valid ambient light data is received and the user adjusts the brightness, the module switches to manual mode.
[0017] S4. The memory module stores the manual mode brightness adjustment level from the last power-off, and automatically restores it upon power-on.
[0018] S5. The temperature detection module detects the internal temperature of the HUD and triggers a protection mechanism when the temperature is too high.
[0019] S6, the output module outputs a pulse width modulation signal to control the backlight brightness.
[0020] Compared with the prior art, the present invention has the following beneficial effects: Attached Figure Description
[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of the HUD automatic brightness adjustment system of the present invention. Detailed Implementation
[0023] The technical solutions of 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 within the scope of protection of the present invention.
[0024] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0025] Example
[0026] like Figure 1As shown in the figure, this invention provides a HUD brightness automatic adjustment system, including an ambient light acquisition module, a manual adjustment module, a control module, a memory module, a temperature detection module, and an output module. The control module is electrically connected to the ambient light acquisition module, the manual adjustment module, the memory module, the temperature detection module, and the output module. The ambient light acquisition module and the control module are used to acquire data related to sunlight intensity and ambient light intensity. The manual adjustment module and the control module are used to receive brightness adjustment commands from the user at different levels. The memory module and the control module are used to store the brightness level at the last power-off. The temperature detection module and the control module are used to detect... The system measures the internal temperature of the HUD; the output module and control module are used to output pulse width modulation (PWM) signals to control the backlight brightness; in this embodiment, the manual adjustment module refers to the central control screen and entertainment audio-visual controller of the vehicle system, the memory module uses an ST chip, specifically model M24128, the control module uses an NXP MCU chip, specifically model S32K144, the temperature detection module uses a KYOCERA screen, specifically model T-55931GD018HU-T-ARN, and the output module uses an MPS chip, specifically model MPQ3364.
[0027] As an advanced solution provided by HUD brightness automatic adjustment system, when the ambient light acquisition module obtains ambient light intensity related data, it takes the average value of the ambient light illuminance value within 3 seconds. If the change range exceeds 30,000 lux, it takes the previous value and then takes the average value.
[0028] As an advanced solution provided by the HUD brightness automatic adjustment system, the preset strategy of the control module includes automatic mode and manual mode. In automatic mode, the adjustment level is based on the manual mode adjustment level and combined with the ambient light brightness adaptive adjustment. When the control module does not receive valid ambient light data and the user adjusts the brightness, it automatically switches to manual mode.
[0029] As an advanced solution provided by the HUD brightness automatic adjustment system, the following conditions must be met to activate the automatic mode: the HUD display is normal, the CANFD (Controller Area Network with Flexible Data Rate) communication is normal, and the control module receives the ambient light brightness and automatic adjustment start signal from the external sensor.
[0030] As an improved solution provided by the HUD brightness automatic adjustment system, when the temperature detection module detects that the internal temperature of the HUD is ≥75℃, the control module controls the HUD panel to reduce its brightness; when the temperature detection module detects that the internal temperature of the HUD is ≥95℃, the control module controls and turns off the HUD, sends an over-temperature signal to the IVI (in-vehicle infotainment system), and the central control display screen pops up an over-temperature warning; when the temperature detection module detects that the internal temperature of the HUD has recovered to 85℃, the control module controls the HUD to automatically turn on.
[0031] As an improved solution provided by the HUD brightness automatic adjustment system, in automatic adjustment mode, the manual brightness adjustment PWM value = A × the currently calibrated maximum brightness PWM + B, where A is the coefficient corresponding to different brightness levels, B is the calibration value, and the lower limit of PWM is 0.2%.
[0032] As an advanced solution provided by the HUD brightness automatic adjustment system, it also includes a verification module, which is electrically connected to the output module and is used to verify whether the brightness corresponding to the PWM signal output by the output module meets the expectations. If it does not meet the expectations, the output module can adjust the brightness.
[0033] This invention provides a HUD brightness automatic adjustment system and method, the specific implementation of which is as follows:
[0034] 1. The ambient light acquisition module is equipped with a sunlight and rain sensor. The sensor detects the ambient light intensity and obtains relevant data such as sunlight intensity and ambient light brightness. The average value of the ambient light intensity within 3 seconds is taken. If the change range exceeds 30,000 lux, the previous value is taken and then the average value is taken again. The data is then transmitted to the control module.
[0035] 2. The user operates the manual adjustment module through the steering wheel combination switch and inputs different levels of brightness adjustment commands (for ease of explanation, the brightness adjustment levels are set to 1-10 in this embodiment, but are not limited to the brightness level division of 1-10). The manual adjustment module transmits the commands to the control module.
[0036] 3. The control module receives ambient light data and adjustment commands, and determines whether the automatic mode start conditions are met, namely, the HUD is in display mode, CANFD communication is normal, ambient light brightness is received from the external sensor, and the HUD automatic brightness adjustment mode is activated signal is received. If these conditions are met, the module enters automatic mode and adjusts the brightness based on the manual mode adjustment level combined with the ambient light adaptively. If no valid ambient light data is received and the user makes adjustments, the module switches to manual mode.
[0037] 4. The memory module stores the manual mode brightness level from the last power-off. When the HUD is powered on, the control module retrieves that ambient light brightness level from the memory module and automatically restores it. When there is no stored brightness level information and no valid signal is received from the sunlight / rain sensor, the HUD's backlight will turn on at 50% of the maximum virtual image brightness, which is the 5th level of manual brightness adjustment.
[0038] 5. The temperature detection module monitors the internal temperature of the HUD in real time and transmits the temperature data to the control module. When the temperature is ≥75℃, the control module controls the brightness to decrease; when the temperature is ≥95℃, the control module controls the HUD to automatically turn off, sends an over-temperature signal to the IVI, the instrument displays an alarm, and the display turns off after 3 seconds; when the temperature returns to 85℃, the control module controls the HUD to automatically turn on.
[0039] 6. The output module outputs a PWM signal to control the backlight brightness according to the instructions of the control module. In automatic adjustment mode, the manual brightness adjustment PWM value = A × the current calibrated maximum brightness PWM + B, where A is the coefficient of 0.1-1.0 corresponding to levels 1-10, B is the calibration value, and the lower limit of PWM is 0.2%.
[0040] 7. Optionally, the verification module verifies the brightness corresponding to the output PWM signal. If it does not meet expectations, the output PWM signal is adjusted.
[0041] 8. When the IVI brightness adjustment signal times out, the HUD remains in its current state. Once the signal is restored, it will execute according to the signal logic.
[0042] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.
[0043] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.
Claims
1. A HUD brightness automatic adjustment system, characterized in that, The device includes an ambient light acquisition module, a manual adjustment module, a control module, a memory module, a temperature detection module, and an output module. The control module is electrically connected to the ambient light acquisition module, the manual adjustment module, the memory module, the temperature detection module, and the output module. The ambient light acquisition module and the control module are used to acquire data related to sunlight intensity and ambient light intensity. The manual adjustment module and the control module are used to receive brightness adjustment commands from the user at different levels. The memory module and the control module are used to store the brightness level at the last power-off. The temperature detection module and the control module are used to detect the internal temperature of the HUD. The output module and the control module are used to output pulse width modulation signals to control the backlight brightness.
2. The HUD brightness automatic adjustment system according to claim 1, characterized in that, When the ambient light acquisition module acquires ambient light intensity related data, it takes the average value of the ambient light illuminance within 3 seconds. If the range of change exceeds 30,000 lux, it takes the previous value and then takes the average value.
3. The HUD brightness automatic adjustment system according to claim 1, characterized in that, The preset strategies of the control module include automatic mode and manual mode. In automatic mode, the adjustment level is based on manual mode and combined with ambient light intensity for adaptive adjustment. When the control module does not receive valid ambient light data and the user makes adjustments, it automatically switches to manual mode.
4. The HUD brightness automatic adjustment system according to claim 3, characterized in that, The following conditions must be met to activate the automatic mode: the HUD display is normal and the control module receives the ambient light brightness and automatic adjustment activation signal collected by the ambient light acquisition module.
5. The HUD brightness automatic adjustment system according to claim 1, characterized in that, When the temperature detection module detects that the internal temperature of the HUD is ≥75℃, the control module controls the HUD panel to reduce its brightness; when the temperature detection module detects that the internal temperature of the HUD is ≥95℃, the control module controls and turns off the HUD; when the temperature detection module detects that the internal temperature of the HUD has recovered to 85℃, the control module controls the HUD to automatically turn on.
6. The HUD brightness automatic adjustment system according to claim 1, characterized in that, In automatic adjustment mode, the manual adjustment value of brightness pulse width modulation is A × the current calibrated maximum brightness pulse width modulation + B, where A is the coefficient corresponding to different brightness levels, B is the calibration value, and the lower limit of pulse width modulation is 0.2%.
7. The HUD brightness automatic adjustment system according to claim 1, characterized in that, It also includes a verification module, which is electrically connected to the output module and is used to verify whether the brightness corresponding to the pulse width modulation signal output by the output module meets expectations. If it does not meet expectations, the output module can adjust the brightness.
8. A method for automatically adjusting the brightness of a HUD, characterized in that, Includes the following steps: S1. The ambient light acquisition module collects data related to ambient light intensity. S2. The manual adjustment module receives different levels of brightness adjustment commands input by the user; S3. The control module controls the brightness adjustment of the HUD according to the ambient light data and adjustment instructions, and adjusts the brightness of the HUD according to the preset strategy. The automatic mode is based on the adjustment level of the manual mode and combines the ambient light brightness for adaptive adjustment. When no valid ambient light data is received and the user adjusts the brightness, the module switches to manual mode. S4. The memory module stores the brightness level adjusted manually during the last power-off, and automatically restores it upon power-on. S5. The temperature detection module detects the internal temperature of the HUD and triggers a protection mechanism when the temperature is too high. S6, the output module outputs a pulse width modulation signal to control the backlight brightness.