Brightness adjusting method of head-up display system, electronic equipment, system, vehicle, medium and product

Abstract

The invention discloses a brightness adjusting method of a head-up display system, electronic equipment, the head-up display system, a vehicle, a computer readable storage medium and a computer program product. The method comprises the following steps: determining the reflectivity corresponding to each light-emitting unit according to the position of an eye box; and determining the brightness of each light-emitting unit according to the reflectivity so as to adjust the brightness of the head-up display system. Therefore, the user can realize the brightness adjustment of the head-up display system. Moreover, the brightness adjustment of the head-up display system can be carried out according to the reflectivity corresponding to each light-emitting unit determined by the position of the eye box, so that the brightness adjustment of the head-up display system can be carried out before each light-emitting unit emits light, and the hysteresis of the brightness adjustment can be reduced to a certain extent. Therefore, the brightness uniformity of images displayed by the head-up display system is ensured.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a brightness adjustment method for a head-up display system, an electronic device, a head-up display system, a vehicle, a computer-readable storage medium, and a computer program product. Background Art

[0002] When displaying vehicle-related information via head-up display (HUD) technology, the related art determines the brightness of different display areas based on images captured by the vehicle's camera, and then adjusts the brightness of each display area to ensure balanced brightness across the display areas. However, since brightness adjustment is performed after the vehicle-related information is displayed, there is a certain lag in brightness adjustment, which to some extent affects the user experience. Summary of the Invention

[0003] The present application provides a brightness adjustment method for a head-up display system, an electronic device, a head-up display system, a vehicle, a computer-readable storage medium, and a computer program product.

[0004] An embodiment of the present application provides a method for adjusting brightness of a head-up display system, wherein the display light source of the head-up display system includes a plurality of independently controllable light-emitting units, and the method includes:

[0005] Determining the reflectivity corresponding to each of the light-emitting units according to the position of the eye box;

[0006] The brightness of each of the light-emitting units is determined according to the reflectivity to adjust the brightness of the head-up display system.

[0007] Thus, in the head-up display system brightness adjustment method, brightness adjustment device, electronic device, and head-up display system of the embodiments of the present application, the reflectivity corresponding to each light-emitting unit can be determined based on the eyebox position, and the brightness of each light-emitting unit can be determined based on the reflectivity, thereby achieving brightness adjustment of the head-up display system. Furthermore, compared to a method of adjusting the brightness of the head-up display system based on the brightness of each region in the displayed image after the head-up display system displays the image, because the brightness of the head-up display system can be adjusted based on the reflectivity corresponding to each light-emitting unit determined by the eyebox position, the brightness adjustment of the head-up display system can be performed before each light-emitting unit emits light, thereby reducing the lag of the brightness adjustment to a certain extent, thereby ensuring the uniformity and real-time performance of the brightness of the displayed image of the head-up display system.

[0008] In some embodiments, determining the reflectivity corresponding to each of the light-emitting units according to the eye box position includes:

[0009] Determining the incident angle corresponding to each of the light-emitting units according to the eye box position;

[0010] The reflectivity corresponding to each light-emitting unit is determined according to the incident angle corresponding to each light-emitting unit.

[0011] In this way, the incident angle corresponding to each light-emitting unit is determined based on the eyebox position; and the reflectivity corresponding to each light-emitting unit is determined based on the incident angle corresponding to each light-emitting unit. In this way, by first determining the incident angle of the light-emitting unit based on the eyebox position, its corresponding reflectivity can be determined, providing data basis for actively adjusting brightness to achieve uniformity of display units.

[0012] In some embodiments, the light emitted by the light-emitting unit is reflected by a reflective surface of a front windshield of the vehicle and then emitted toward the eyebox position, and determining the incident angle corresponding to each light-emitting unit according to the eyebox position includes:

[0013] The incident angle of each of the light-emitting units relative to the reflective surface is determined according to the eye box position.

[0014] In this way, the incident angle of each light-emitting unit relative to the reflective surface is determined based on the eyebox position. Based on the eyebox position information and the law of reflection, the reflective surface of the front windshield will reflect the light at a certain angle, allowing the light to accurately enter the user's eyes and form a clear display image. The incident angle of the light along the reflection path can also be obtained, providing a basis for subsequently obtaining the reflectivity and adjusting the brightness.

[0015] In some embodiments, the reflective surface is not completely transparent.

[0016] In this way, the reflective surface is in a non-completely transparent state. In this way, the non-completely transparent reflective surface can reduce the influence of external ambient light on the image emitted and displayed by the reflective surface.

[0017] In some embodiments, determining the incident angle of each light-emitting unit relative to the reflective surface based on the eye box position includes:

[0018] The incident angle corresponding to each light emitting unit is determined according to the eye box position, the first attribute information of the vehicle front windshield, the second attribute information of the display light source and the position information of the light emitting unit.

[0019] In this way, the incident angle corresponding to each light-emitting unit is determined based on the eyebox position, the first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light-emitting unit. This allows the incident angle to be accurately calculated using multiple pieces of information, enabling the system to precisely control the brightness of each light-emitting unit based on actual conditions, improving the accuracy of the display system and reducing the lag in brightness adjustment to a certain extent, thereby ensuring uniform brightness of the head-up display system's displayed image.

[0020] In some embodiments, the first attribute information includes a first profile category and / or a first installation angle.

[0021] In this way, the first attribute information includes the first profile type and / or the first installation angle. In this way, it is necessary to combine the first profile type and / or the first installation angle with information such as the position of the human eye and the position of the light-emitting unit to accurately measure the incident angle of each light-emitting unit, thereby adjusting the brightness to make the display brightness uniform.

[0022] In some embodiments, the second attribute information includes a second profile category and / or a second installation angle.

[0023] In this case, the second attribute information includes the second profile type and / or the second installation angle. Therefore, the second profile type and / or the second installation angle must be combined with information such as the position of the human eye and the position of the light-emitting units to accurately measure the incident angle of each light-emitting unit, thereby adjusting the brightness to achieve uniform display brightness.

[0024] In some embodiments, determining the reflectivity corresponding to each light-emitting unit according to the incident angle corresponding to each light-emitting unit includes:

[0025] The reflectivity corresponding to each light-emitting unit is determined according to the incident angle corresponding to each light-emitting unit and predetermined reflection angle-reflectivity mapping relationship data.

[0026] In this way, the reflectivity of each light-emitting unit is determined based on the incident angle corresponding to each light-emitting unit and the predetermined reflection angle-reflectivity mapping relationship data. In this way, the incident angle of each light-emitting unit is calculated in combination with information such as the user's eye position. The system can then obtain the corresponding reflectivity based on the reflection angle-reflectivity mapping relationship data, and then control the luminance of different areas of the display light source to match the reflectivity to achieve uniform brightness at the human eye.

[0027] In some embodiments, determining the brightness of each of the light-emitting units based on the reflectivity to adjust the brightness of the head-up display system includes:

[0028] Determining an expected brightness of reflected light corresponding to each of the light-emitting units according to the expected brightness of the light-emitting units and the reflectivity;

[0029] According to the desired brightness of the reflected light, a target light emitting brightness of the light emitting unit is determined to adjust the brightness of the head-up display system.

[0030] In this way, the desired brightness of reflected light corresponding to each light-emitting unit is determined based on its desired brightness and reflectivity. Based on the desired brightness of the reflected light, the target brightness of the light-emitting unit is determined to adjust the brightness of the head-up display system. By calculating the desired brightness of the reflected light and then inferring the target brightness, and using reflectivity to compensate for brightness differences at different incident angles, this prevents uneven reflected brightness caused by different incident angles and ensures uniform brightness perceived by the human eye.

[0031] In some embodiments, determining the target luminous brightness of the luminous unit based on the desired brightness of the reflected light to adjust the brightness of the head-up display system includes:

[0032] determining a brightness balance index according to the expected brightness of the reflected light corresponding to each of the light-emitting units;

[0033] According to the brightness balance index, a target light emitting brightness of the light emitting unit is determined to adjust the brightness of the head-up display system.

[0034] In this way, a brightness balance index is determined based on the expected brightness of reflected light corresponding to each light-emitting unit. Based on the brightness balance index, the target brightness of the light-emitting unit is determined to adjust the brightness of the head-up display system. In this way, adjusting the brightness of the head-up display system based on the target brightness of the light-emitting unit according to the brightness balance index can eliminate brightness unevenness caused by differences in incident angles, reduce the lag in brightness adjustment to a certain extent, make the display more uniform, reduce visual fatigue, and improve driving safety.

[0035] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0036] An embodiment of the present application provides a system including a plurality of light-emitting units and the above-mentioned electronic device.

[0037] An embodiment of the present application provides a vehicle, including the above-mentioned electronic device, to implement the steps of the above-mentioned method.

[0038] An embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by one or more processors, the steps of the above method are implemented.

[0039] An embodiment of the present application provides a computer program product, including a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0040] The electronic device, system, vehicle, computer-readable storage medium, and computer program product provided in the embodiments of the present application determine the reflectivity corresponding to each light-emitting unit based on the eyebox position; and determine the brightness of each light-emitting unit based on the reflectivity to adjust the brightness of the head-up display system. In this way, the reflectivity corresponding to each light-emitting unit can be determined based on the eyebox position, and the brightness of each light-emitting unit can be determined based on the reflectivity, thereby achieving brightness adjustment of the head-up display system. Furthermore, compared to a method of adjusting the brightness of the head-up display system based on the brightness of each region in the displayed image after the head-up display system displays the image, because the brightness of the head-up display system can be adjusted based on the reflectivity corresponding to each light-emitting unit determined by the eyebox position, the brightness adjustment of the head-up display system can be performed before each light-emitting unit emits light, thereby reducing the lag in brightness adjustment to a certain extent and ensuring uniform brightness of the image displayed by the head-up display system.

[0041] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 This is one of the flow charts of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0044] Figure 2 This is a second flow chart of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0045] Figure 3 This is a third flow chart of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0046] Figure 4 This is a schematic diagram of light reflection in a brightness adjustment method of a head-up display system according to certain embodiments of the present application;

[0047] Figure 5 This is a fourth flow chart of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0048] Figure 6is a schematic diagram of the optical path of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0049] Figure 7 This is a fifth flow chart of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0050] Figure 8 This is a schematic diagram of the reflection angle-reflectivity mapping relationship data of the brightness adjustment method of the head-up display system in certain embodiments of the present application;

[0051] Figure 9 This is a sixth flow chart of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0052] Figure 10 is a schematic diagram of a light emitting unit of a brightness adjustment method for a head-up display system according to certain embodiments of the present application;

[0053] Figure 11 This is the seventh flow chart of the brightness adjustment method of the head-up display system in certain embodiments of the present application;

[0054] Figure 12 This is a schematic diagram of the steps of a method for adjusting the brightness of a head-up display system in certain embodiments of the present application. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0056] In related technologies, head-up display (HUD) technology displays vehicle-related information by using images captured by a camera inside the vehicle to determine the brightness of different display areas, and then adjusts the luminous brightness of each display area to ensure balanced brightness of different display areas.

[0057] However, HUD technology adjusts brightness after the vehicle's relevant information is displayed, often resulting in a delay in brightness adjustment. For example, if the user moves their gaze or changes their sitting position, the display may briefly appear brighter or darker. The system then needs to analyze and process the image captured by the in-car camera before adjusting the brightness of the display area to ensure legibility of the HUD information.

[0058] In addition, the lag in brightness adjustment can affect the user experience to a certain extent. If the system is unable to adjust the display brightness in a timely manner, the user may see brief brightness fluctuations when shifting their gaze, which may cause visual fatigue or difficulty recognizing information. For example, in high-speed driving scenarios, if the brightness adjustment lag exceeds 40-50ms, it may affect the user's real-time perception of vehicle driving information such as speed and navigation information, posing a certain driving safety risk.

[0059] Based on the above questions, please refer to Figure 1 The present application provides a method for adjusting the brightness of a head-up display system, wherein the display light source of the head-up display system includes a plurality of independently controllable light-emitting units. The method includes:

[0060] 01: Determine the reflectivity of each light-emitting unit according to the position of the eye box;

[0061] 02: Based on the reflectivity, determine the brightness of each light-emitting unit to adjust the brightness of the head-up display system.

[0062] Embodiments of the present application provide a brightness adjustment device for a head-up display system. The brightness adjustment method for a head-up display system provided in embodiments of the present application can be implemented using the brightness adjustment device for a head-up display system in embodiments of the present application. Specifically, the brightness adjustment device for a head-up display system includes a reflectivity determination module and a brightness adjustment module. The reflectivity determination module is configured to determine the reflectivity corresponding to each light-emitting unit based on the eyebox position. The brightness adjustment module is configured to determine the brightness of each light-emitting unit based on the reflectivity to adjust the brightness of the head-up display system.

[0063] An embodiment of the present application provides an electronic device comprising a memory and a processor. A brightness adjustment method for a head-up display system according to an embodiment of the present application can be implemented by the electronic device according to an embodiment of the present application. Specifically, the memory stores a computer program, and the processor is configured to determine the reflectivity corresponding to each light-emitting unit based on the position of the eye box. The processor is further configured to determine the brightness of each light-emitting unit based on the reflectivity to adjust the brightness of the head-up display system.

[0064] An embodiment of the present application provides a head-up display system, including the electronic device provided in the embodiment of the present application.

[0065] Specifically, the head-up display system is a near-eye display technology that projects images or information in front of the user's field of view. It allows users to drive without having to look down at the instrument or screen, thereby improving operational safety and immersion.

[0066] The head-up display system in the embodiment of the present application includes components such as a measuring device, a display light source, and a brightness adjustment device. The measuring device can measure the position of the user's eyes in real time, that is, the eye box position in the brightness adjustment method of the head-up display system in the embodiment of the present application.

[0067] The display light source is used to project driving information onto the windshield in front of the user's line of sight. Light is reflected by the glass to form a display image for the user, allowing the user to obtain driving information without having to look down at the instrument panel or other devices. The display light source can be a single display screen or a combination of multiple display screens, each of which can be divided into multiple light-emitting units. The brightness adjustment device can independently control the brightness of each light-emitting unit.

[0068] It is understandable that in the process of light being reflected by the front windshield, since the display light source may have different types of polarized light, such as S-polarized light, P-polarized light, and S and P mixed polarized light, the corresponding reflectivity is different. In addition, the position of the light-emitting unit is different, and the incident angle of the light emitted by it into the glass is different, which may also cause the reflectivity to change. In an example, the reflectivity of P-polarized light is about 1.5% at an incident angle of 64°, and the reflectivity is about 5% at an incident angle of 71°. Under the same screen brightness conditions, the reflected brightness may differ by more than 3 times. As a result, the brightness of the reflected light from each light-emitting unit is uneven, resulting in uneven brightness of the displayed image.

[0069] In the embodiments of the present application, to achieve uniform brightness of the displayed image, calculations can be performed based on the real-time measured eye box position information, combined with information such as the position of the light-emitting unit, to obtain information about the light path of light emitted by each light-emitting unit and reflected to the user's eye. This allows the incident angle corresponding to each light-emitting unit to be obtained, and then the corresponding reflectivity can be determined based on the polarization information, providing accurate data support for brightness adjustment of the light-emitting unit. Because the brightness at the eye is related to the brightness of the light-emitting unit and the reflectivity of the corresponding area, compared to the method of adjusting the brightness of the head-up display system based on the brightness of each area in the displayed image after the image is displayed by the head-up display system, after obtaining the reflectivity corresponding to each light-emitting unit, the brightness of the light-emitting unit can be actively adjusted to match the reflectivity, thereby reducing the lag of brightness adjustment to a certain extent, achieving real-time brightness adjustment of the head-up display system, and ensuring the uniformity and real-time brightness of the head-up display system's displayed image.

[0070] In summary, in the head-up display system brightness adjustment method, brightness adjustment device, electronic device, and head-up display system of the embodiments of the present application, the reflectivity corresponding to each light-emitting unit can be determined based on the eyebox position, and the brightness of each light-emitting unit can be determined based on the reflectivity, thereby achieving brightness adjustment of the head-up display system. Furthermore, compared to a method of adjusting the brightness of the head-up display system based on the brightness of each region in the displayed image after the head-up display system displays the image, because the brightness of the head-up display system can be adjusted based on the reflectivity corresponding to each light-emitting unit determined by the eyebox position, the brightness adjustment of the head-up display system can be performed before each light-emitting unit emits light. This can reduce the lag of brightness adjustment to a certain extent, thereby ensuring the uniformity and real-time performance of the brightness of the displayed image of the head-up display system.

[0071] See also Figure 2 In some embodiments, step 01 (determining the reflectivity corresponding to each light-emitting unit according to the eye box position) includes:

[0072] 011: Determine the incident angle corresponding to each light-emitting unit according to the position of the eye box;

[0073] 012: Determine the reflectivity corresponding to each light-emitting unit according to the incident angle corresponding to each light-emitting unit.

[0074] In some embodiments, the reflectivity determination module is further configured to determine the incident angle corresponding to each light emitting unit according to the eye box position. The reflectivity determination module is further configured to determine the reflectivity corresponding to each light emitting unit according to the incident angle corresponding to each light emitting unit.

[0075] In some embodiments, the processor is further configured to determine the incident angle corresponding to each light-emitting unit based on the eye box position. The processor is further configured to determine the reflectivity corresponding to each light-emitting unit based on the incident angle corresponding to each light-emitting unit.

[0076] Specifically, the incident angle refers to the angle between the path of light entering the windshield and the normal of the windshield surface. It is determined by data such as the position of the light-emitting unit, the position of the eye box, the shape of the windshield, and the installation angle, and is used to determine the reflectivity of the corresponding light-emitting unit.

[0077] The windshield's reflectivity varies for light incident at different angles. For example, at an angle of 64°, the reflectivity for P-polarized light is approximately 1.5%, while at 71°, the reflectivity is approximately 5%. This difference of more than three times in reflected brightness at the same light source brightness is the primary cause of display unevenness. Therefore, compared to adjusting the brightness of the head-up display based on the brightness of each area of ​​the displayed image after the image is displayed on the head-up display, pre-determining the incident angle for each light-emitting unit based on the eyebox position allows for precise adjustment of light brightness based on reflectivity differences, achieving uniform display light source brightness.

[0078] Based on the real-time collected eye box position, combined with the position information of the front windshield, display light source, and each light-emitting unit, the incident angle corresponding to each light-emitting unit can be calculated through geometric calculations to obtain the reflectivity corresponding to each light-emitting unit.

[0079] In this way, the incident angle corresponding to each light-emitting unit is determined based on the eyebox position; and the reflectivity corresponding to each light-emitting unit is determined based on the incident angle corresponding to each light-emitting unit. In this way, by first determining the incident angle of the light-emitting unit based on the eyebox position, its corresponding reflectivity can be determined, providing data basis for actively adjusting brightness to achieve uniformity of display units.

[0080] See also Figure 3 In some embodiments, step 011 (determining the incident angle corresponding to each light-emitting unit according to the eye box position) includes:

[0081] 0111: Determine the incident angle of each light-emitting unit relative to the reflective surface based on the eyebox position. Light emitted by the light-emitting unit is reflected by the reflective surface of the vehicle's front windshield and then directed toward the eyebox position.

[0082] In some embodiments, the reflectivity determination module is further configured to determine the incident angle of each light emitting unit relative to the reflective surface according to the position of the eye box.

[0083] In some embodiments, the processor is further configured to determine an incident angle of each light emitting unit relative to the reflective surface based on the position of the eye box.

[0084] Specifically, the reflective surface refers to the reflective surface of the front windshield that reflects light. The front windshield is used to reflect light to the user's eyes to achieve the head-up display function.

[0085] The following Figure 4 The process of determining the angle of incidence is explained using the following example:

[0086] Light emitted by the light-emitting unit reflects off the windshield before entering the user's eyes. Based on the law of reflection, the angle of incidence of light entering the windshield is equal to the angle of reflection. This allows the light-emitting unit to adjust the direction of emitted light based on the position of the eye box, ensuring that the displayed information is accurately imaged where the human eye can see it.

[0087] Therefore, based on the eye box position collected in real time by the measuring device, the angle between the light from each light-emitting unit and the normal when it hits the glass surface, i.e., the incident angle θ, can be calculated. This provides a data basis for the subsequent acquisition of the reflectivity, thereby adjusting the brightness of the light emitted by the light-emitting unit to adjust the brightness of the head-up display system and make the brightness of the display screen evenly distributed.

[0088] In this way, the incident angle of each light-emitting unit relative to the reflective surface is determined based on the eyebox position. Based on the eyebox position information and the law of reflection, the reflective surface of the front windshield will reflect the light at a certain angle, allowing the light to accurately enter the user's eyes and form a clear display image. The incident angle of the light along the reflection path can also be obtained, providing a basis for subsequently obtaining the reflectivity and adjusting the brightness.

[0089] In some embodiments, the reflective surface is not completely transparent.

[0090] Specifically, when a transparent reflective surface is affected by ambient light, for example, if part of the reflective surface is shaded by a tree while other parts are not, the brightness of the transparent reflective surface can affect the uniformity of the displayed image. Non-transparent reflective surfaces, on the other hand, can ignore or filter out the interference of ambient light. Furthermore, if ambient light affects the same reflective surface differently, any non-transparent color, such as black, yellow, or green, can be used. Black reflective surfaces are more resistant to interference, providing higher contrast and clarity, and are therefore preferred.

[0091] In this way, the reflective surface is in a non-completely transparent state. In this way, the non-completely transparent reflective surface can reduce the influence of external ambient light on the image emitted and displayed by the reflective surface.

[0092] See also Figure 5 In some embodiments, step 0111 (determining the incident angle of each light-emitting unit relative to the reflective surface based on the eye box position) includes:

[0093] 01111: Determine the incident angle corresponding to each light-emitting unit according to the eye box position, the first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light-emitting unit.

[0094] In some embodiments, the reflectivity determination module is further used to determine the incident angle corresponding to each light-emitting unit based on the eye box position, the first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light-emitting unit.

[0095] In some embodiments, the processor is further configured to determine the incident angle corresponding to each light emitting unit based on the eye box position, the first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light emitting unit.

[0096] Specifically, the display light source can be one or more display screens, each of which can be divided into multiple light-emitting units. The display light source is used to project driving information onto the front windshield. The light is reflected to the user's eyes to form a display screen, allowing the user to obtain driving information without having to look down at the dashboard or other devices.

[0097] The first attribute information refers to attribute information of the front windshield surface, such as curved surface or non-curved surface.

[0098] The second attribute information refers to attribute information such as the installation angle or the profile of the display light source, for example, curved surface or non-curved surface.

[0099] The first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light-emitting unit are all known information and can be directly obtained.

[0100] Moreover, the incident angle is related to the position information of the light emitting unit. Figure 6 Taking the multiple display screens shown as an example, it can be seen from the light paths of the light emitting units in different areas of the multiple display screens that the incident angles corresponding to the light emitted by the light emitting units in different areas reflected into the user's eyes are different.

[0101] Based on the real-time acquired eye box position and the known surface information of the vehicle's front windshield, the installation angle or surface information of the display light source, and the position information of each light-emitting unit, the incident angle corresponding to each light-emitting unit can be determined by performing geometric calculations through a pre-trained model.

[0102] In this way, the incident angle corresponding to each light-emitting unit is determined based on the eyebox position, the first attribute information of the vehicle's front windshield, the second attribute information of the display light source, and the position information of the light-emitting unit. This allows the incident angle to be accurately calculated using multiple pieces of information, enabling the system to precisely control the brightness of each light-emitting unit based on actual conditions, improving the accuracy of the display system and reducing the lag in brightness adjustment to a certain extent, thereby ensuring uniform brightness of the head-up display system's displayed image.

[0103] In some embodiments, the first attribute information includes a first profile category and / or a first installation angle.

[0104] Specifically, the first profile category refers to the profile category of the vehicle front windshield, including curved surfaces and non-curved surfaces. The first installation angle refers to the installation angle of the vehicle front windshield.

[0105] The shape and installation angle of the windshield affect the angles at which light strikes the reflective surface. The glass surface has varying reflectivity for light at different incident angles, which in turn affects the brightness of the reflected light. This can lead to significant differences in reflected brightness across different areas of the displayed image, affecting brightness uniformity.

[0106] In this case, the first attribute information includes the first profile type and / or the first installation angle. Therefore, the first profile type and / or the first installation angle must be combined with information such as the position of the human eye and the position of the light-emitting units to accurately measure the incident angle of each light-emitting unit, thereby achieving uniform brightness of the display screen by adjusting the brightness of the light-emitting units.

[0107] In some embodiments, the second attribute information includes a second profile category and / or a second installation angle.

[0108] Specifically, the second profile category refers to the profile category of the display screen in the display light source, including curved surfaces and non-curved surfaces. The second installation angle refers to the installation angle of the display screen in the display light source.

[0109] Similarly, the shape and mounting angle of the display screen in a display light source also affect the angles at which light strikes the reflective surface. The glass surface has varying reflectivity for light at different incident angles, which in turn affects the brightness reflected into the eye. This can lead to significant differences in reflected brightness across different areas of the displayed image, affecting the uniformity of the display brightness.

[0110] In this case, the second attribute information includes the second profile type and / or the second installation angle. By combining the second profile type and / or the second installation angle with information such as the position of the human eye and the position of the light-emitting units, the incident angle of each light-emitting unit can be accurately measured, thereby achieving uniform brightness of the display screen by adjusting the brightness of the light-emitting units.

[0111] See also Figure 7 In some embodiments, step 012 (determining the reflectivity corresponding to each light-emitting unit based on the incident angle corresponding to each light-emitting unit) includes:

[0112] 0121: Determine the reflectivity corresponding to each light-emitting unit according to the incident angle corresponding to each light-emitting unit and predetermined reflection angle-reflectivity mapping relationship data.

[0113] In some embodiments, the reflectivity determination module is further configured to determine the reflectivity corresponding to each light emitting unit according to the incident angle corresponding to each light emitting unit and predetermined reflection angle-reflectivity mapping relationship data.

[0114] In some embodiments, the processor is further configured to determine the reflectivity corresponding to each light emitting unit based on the incident angle corresponding to each light emitting unit and predetermined reflection angle-reflectivity mapping relationship data.

[0115] Specifically, the reflection angle-reflectivity mapping relationship data is as follows: Figure 8As shown in the figure, the horizontal axis is the incident angle from 0° to 90°, and the vertical axis is the reflectivity from 0% to 100%. Different polarizations have different reflectivities at the same incident angle. Curve a in the figure shows the reflectivity variation of S-polarized light, curve b shows the reflectivity variation of S / P mixed polarized light, and curve c shows the reflectivity variation of P-polarized light. These variations of different polarizations are pre-stored in the system.

[0116] Combined with information such as the user's eye position, the incident angle of each light-emitting unit can be obtained through calculation. The system can directly query and obtain its corresponding reflectivity based on the reflection angle-reflectivity mapping relationship data, and then adjust the brightness of the light-emitting unit to match the reflectivity. For example, when the incident angle of a light-emitting unit is 71° and it is P-polarized light, its corresponding reflectivity can be directly obtained to be approximately 1.5%. This reflectivity is low, and the brightness of the light-emitting unit can be appropriately increased to achieve uniformity of the brightness incident on the user's eyes; conversely, light-emitting units with high reflectivity can be achieved by reducing the brightness of the light source, so that the brightness of the light reflected into the eye by each light-emitting unit meets the requirements of uniform image display.

[0117] In this way, the reflectivity of each light-emitting unit is determined based on the incident angle corresponding to each light-emitting unit and the predetermined reflection angle-reflectivity mapping relationship data. In this way, the incident angle of each light-emitting unit is calculated in combination with information such as the user's eye position. The system can then obtain the corresponding reflectivity based on the reflection angle-reflectivity mapping relationship data, and then control the luminance of different areas of the display light source to match the reflectivity to achieve the brightness reflected into the eye to meet the requirements of uniform display image.

[0118] See also Figure 9 In some embodiments, step 02 (determining the brightness of each light-emitting unit to adjust the brightness of the head-up display system based on the reflectivity) includes:

[0119] 021: Determine the expected brightness of reflected light corresponding to each light-emitting unit according to the expected brightness and reflectivity of each light-emitting unit;

[0120] 022: Determine the target luminous brightness of the luminous unit based on the expected brightness of the reflected light to adjust the brightness of the head-up display system.

[0121] In some embodiments, the brightness adjustment module is further configured to determine a desired brightness of reflected light corresponding to each light-emitting unit based on the desired brightness and reflectivity of each light-emitting unit. The brightness adjustment module is further configured to determine a target brightness of the light-emitting unit based on the desired brightness of the reflected light to adjust the brightness of the head-up display system.

[0122] In some embodiments, the processor is further configured to determine a desired brightness of reflected light corresponding to each light-emitting unit based on the desired brightness and reflectivity of each light-emitting unit. The processor is further configured to determine a target brightness of the light-emitting unit based on the desired brightness of the reflected light to adjust the brightness of the head-up display system.

[0123] Specifically, the expected luminous brightness is the original luminous intensity value that the head-up display system expects the luminous unit to achieve, and is usually set based on display effect requirements.

[0124] The expected brightness of reflected light refers to the brightness of the light that enters the user's eyes after reflection. It is the product of the expected luminous brightness and the reflectivity and can be expressed by the following formula: S = L·λ

[0125] Where λ refers to the reflectivity, L refers to the brightness of the light emitted by each light-emitting unit, and S refers to the brightness of the light reflected to the user's eyes.

[0126] The target luminous brightness refers to the brightness value that the light-emitting unit actually needs to output, which is calculated based on the expected brightness of the reflected light. It is used to compensate for the reflectivity difference and ensure that the brightness reflected into the eye meets the requirements of uniform image display.

[0127] The following Figure 10 Taking the display screen shown as an example, the brightness adjustment process of the head-up display system is explained.

[0128] Taking the display units numbered 1 to 10 in the figure as an example, it can be considered that the corresponding light-emitting units emit light to display information, and the rest of the area does not display, that is, the corresponding light-emitting units do not emit light. After measurement, the incident angles of light emitted by the light-emitting units 1 to 10 are θ1, θ2, ..., θ9, θ 10 , whose corresponding reflectivity is λ1, λ2, ..., λ9, λ 10 , the expected luminous brightness is L1, L2, ..., L9, L 10 By calculating the above formula, the expected brightness of the reflected light of the light emitting unit S1, S2, ..., S9, S 10 However, in order to ensure display uniformity, the expected brightness of the reflected light from the two units needs to be consistent, so the target luminous brightness needs to be re-derived.

[0129] Based on the expected brightness of the reflected light S1, S2, ..., S9, S 10 , reverse calculation of target luminous brightness is The target luminous brightness L'1, L'2, ..., L'9, L' can be obtained 10 Therefore, the light emitting unit adjusts the brightness from L to L' and emits light at the target brightness L', thereby adjusting the brightness of the head-up display system and achieving display uniformity.

[0130] In this way, the desired brightness of reflected light corresponding to each light-emitting unit is determined based on its desired brightness and reflectivity. Based on the desired brightness of the reflected light, the target brightness of the light-emitting unit is determined to adjust the brightness of the head-up display system. By calculating the desired brightness of the reflected light and then inferring the target brightness, and using reflectivity to compensate for brightness differences at different incident angles, this can avoid uneven reflected brightness caused by different incident angles, ensuring that the reflected brightness meets the requirements for a uniform image display.

[0131] See also Figure 11 In some embodiments, step 022 (determining the target luminous brightness of the luminous unit to adjust the brightness of the head-up display system based on the expected brightness of the reflected light) includes:

[0132] 0221: Determine the brightness balance index based on the expected brightness of the reflected light corresponding to each light-emitting unit;

[0133] 0222: Based on the brightness balance index, determine the target brightness of the light-emitting unit to adjust the brightness of the head-up display system.

[0134] In some embodiments, the brightness adjustment module is further configured to determine a brightness balance index based on the desired brightness of the reflected light corresponding to each light-emitting unit. The brightness adjustment module is further configured to determine the target brightness of the light-emitting unit based on the brightness balance index to adjust the brightness of the head-up display system.

[0135] In some embodiments, the processor is further configured to determine a brightness balance index based on the desired brightness of the reflected light corresponding to each light-emitting unit. The processor is further configured to determine a target brightness of the light-emitting unit based on the brightness balance index to adjust the brightness of the head-up display system.

[0136] Specifically, the brightness uniformity index refers to a parameter that quantifies the uniformity of the brightness of light reflected from each light-emitting unit within the display area.

[0137] The reflectivity of the light-emitting unit varies due to different incident angles, resulting in differences in the expected brightness of the reflected light reflected to the user's eyes. There may be a maximum brightness S max , and the minimum brightness S min , its brightness balance index can be expressed as the ratio of minimum brightness to maximum brightness, such as the following formula:

[0138]

[0139] The brightness balance index reflects the brightness difference of different light-emitting units in the form of a numerical value. By comparing the brightness balance index with the preset target index, it can be determined whether the brightness of the image displayed by the head-up display system is uniform, providing a clear target for brightness adjustment.

[0140] In one example, the brightness balance index S ≥ 70% can be considered to ensure that the brightness of the head-up display system displays an image uniformly only when the minimum brightness reaches at least 70% of the maximum brightness. More preferably, a preset target index of S ≥ 80% or 90% or 95% or 98% can be used for comparison. In the case that the brightness balance index does not reach the preset target index, the system needs to adjust the brightness of some light-emitting units to meet the brightness balance index to reach the preset target index, thereby adjusting the brightness of the head-up display system and ensuring that the brightness of the head-up display system displays an image uniformly. Compared with the traditional head-up display system brightness adjustment method, the brightness adjustment method of the head-up display system of the embodiment of the present application can actively calculate the incident angle and its corresponding reflectivity, adjust the brightness in advance, reduce the lag of brightness adjustment to a certain extent, make the display picture more uniform, reduce visual fatigue, and improve driving safety.

[0141] It should be noted that the brightness balance index in the embodiment of the present application is only for illustrative purposes and should not be understood as a limitation on the corresponding formula. In other examples, the brightness balance index can also be expressed as S=(S max -S min ) / 2*S ave The formula is not limited here and can be set according to actual conditions.

[0142] In this way, a brightness balance index is determined based on the expected brightness of reflected light corresponding to each light-emitting unit. Based on the brightness balance index, the target brightness of the light-emitting unit is determined to adjust the brightness of the head-up display system. In this way, adjusting the brightness of the head-up display system based on the target brightness of the light-emitting unit according to the brightness balance index can eliminate brightness unevenness caused by differences in incident angles, reduce the lag in brightness adjustment to a certain extent, make the display more uniform, reduce visual fatigue, and improve driving safety.

[0143] The following Figure 12 The brightness adjustment method of the head-up display system according to the embodiment of the present application is described as follows:

[0144] In the head-up display system, the display light source is divided into multiple light-emitting units with independently adjustable brightness. Furthermore, information such as the position of each light-emitting unit, the windshield profile, the windshield mounting angle, the display light source profile, the display light source mounting angle, and the mapping relationship between the reflection angle and reflectivity of each polarized light is pre-stored in memory.

[0145] Based on the head-up display system, the brightness adjustment process is as follows:

[0146] First, the measuring device obtains the position information of the user's eye box through measurement, and inputs the eye box position information into the brightness adjustment device.

[0147] Then, based on the eye box position information, combined with the position information of each light-emitting unit in the memory, the front windshield profile, the front windshield installation angle, the display light source profile and the display light source installation angle, the incident angle information of the light emitted by each light-emitting unit can be obtained by calculation.

[0148] Finally, based on the incident angle information and the data stored in the memory that maps the polarized light reflection angle to reflectivity, the reflectivity corresponding to each light-emitting unit can be obtained. Therefore, by adjusting the brightness of the light-emitting unit based on the obtained reflectivity, the brightness reflected into the eye can be ensured to meet the requirements for uniform image display.

[0149] The present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-mentioned method for adjusting the brightness of a head-up display system.

[0150] It is understood that a computer program includes computer program code. The computer program code may be in source code form, object code form, executable file, or some intermediate form. Computer-readable storage media may include any entity or device capable of carrying computer program code, recording media, USB flash drives, removable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media.

[0151] In the description of this specification, the descriptions with reference to the terms "particularly", "further", "particularly", "understandably", etc. are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms are not intended to refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0152] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable requests for implementing a specific logical function or step of a process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0153] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A brightness adjustment method for a head-up display system, characterized in that: The display light source of the head-up display system includes a plurality of independently controllable light-emitting units, and the method includes: Determining the reflectivity corresponding to each of the light-emitting units according to the position of the eye box; The brightness of each of the light-emitting units is determined according to the reflectivity to adjust the brightness of the head-up display system.

2. The method according to claim 1, characterized in that The step of determining the reflectivity corresponding to each of the light-emitting units according to the eye box position includes: Determining the incident angle corresponding to each of the light-emitting units according to the eye box position; The reflectivity corresponding to each light-emitting unit is determined according to the incident angle corresponding to each light-emitting unit.

3. The method according to claim 2, characterized in that in, The light emitted by the light emitting unit is reflected by the reflective surface of the front windshield of the vehicle and then emitted to the eye box position. The determining of the incident angle corresponding to each light emitting unit according to the eye box position includes: The incident angle of each of the light-emitting units relative to the reflective surface is determined according to the eye box position.

4. The method according to claim 3, characterized in that The reflective surface is not completely transparent.

5. The method according to claim 3, characterized in that Determining the incident angle of each light emitting unit relative to the reflective surface according to the eye box position includes: The incident angle corresponding to each light emitting unit is determined according to the eye box position, the first attribute information of the vehicle front windshield, the second attribute information of the display light source and the position information of the light emitting unit.

6. The method according to claim 5, characterized in that The first attribute information includes a first profile category and / or a first installation angle.

7. The method according to claim 5, characterized in that The second attribute information includes a second profile category and / or a second installation angle.

8. The method according to claim 2, characterized in that The determining the reflectivity corresponding to each light-emitting unit according to the incident angle corresponding to each light-emitting unit includes: The reflectivity corresponding to each light-emitting unit is determined according to the incident angle corresponding to each light-emitting unit and predetermined reflection angle-reflectivity mapping relationship data.

9. The method according to claim 1, characterized in that Determining the brightness of each of the light-emitting units according to the reflectivity to adjust the brightness of the head-up display system includes: Determining an expected brightness of reflected light corresponding to each of the light-emitting units according to the expected brightness of the light-emitting units and the reflectivity; According to the desired brightness of the reflected light, a target light emitting brightness of the light emitting unit is determined to adjust the brightness of the head-up display system.

10. The method according to claim 9, characterized in that The step of determining the target luminous brightness of the luminous unit according to the expected brightness of the reflected light to adjust the brightness of the head-up display system includes: determining a brightness balance index according to the expected brightness of the reflected light corresponding to each of the light-emitting units; According to the brightness balance index, a target light emitting brightness of the light emitting unit is determined to adjust the brightness of the head-up display system.

11. An electronic device, characterized in that: The device comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the brightness adjustment method of the head-up display system according to any one of claims 1 to 10 is implemented.

12. A head-up display system, characterized in that: The electronic device according to claim 11.

13. A vehicle, characterized in that: The vehicle includes the electronic device according to claim 11, or includes the head-up display system according to claim 12.

14. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by one or more processors, the method according to any one of claims 1 to 10 is implemented.

15. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the method according to any one of claims 1 to 10 is implemented.

Images