Backlight control method, backlight control device, head-up display system, equipment and medium

Abstract

The invention provides a backlight control method, a backlight control device, a head-up display system, equipment and a medium, and belongs to the technical field of display. The method comprises the following steps: acquiring ambient light intensity of a carrier; determining a first light source element corresponding to a content sub-region in the head-up display picture in a backlight source of the head-up display equipment; and according to the ambient light intensity, controlling the on-off states of the first light source element and the second light source element, the distance between which and the first light source element is smaller than a preset distance threshold, so that the content sub-region is in the target display brightness. According to the embodiment of the invention, the adjustable range of the display brightness of the head-up display picture can be improved, so that the display brightness better matched with the ambient light intensity is provided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight control method, a backlight control device, a head-up display system, an electronic device, and a computer-readable storage medium. Background Art

[0002] A head-up display (HUD) projects driving-related information, such as speed and navigation, onto an imaging window (such as a rear-mounted imaging board or a vehicle's windshield). This allows the driver to see relevant information without turning or looking down, assisting with driving more efficiently and safely. Similar to conventional displays, HUDs must provide the appropriate virtual image brightness based on ambient light conditions. Summary of the Invention

[0003] The present application provides a backlight control method, a backlight control device, a head-up display system, an electronic device, and a computer-readable storage medium.

[0004] In a first aspect, the present application provides a backlight control method, which includes: obtaining the ambient light intensity of a vehicle; determining a first light source element in the backlight source of a head-up display device corresponding to a content sub-area in a head-up display screen; and according to the ambient light intensity, controlling the switching state of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold, so that the content sub-area is at a target display brightness.

[0005] In second aspect, the present application provides a backlight control device, which includes: an acquisition module for acquiring the ambient light intensity of a vehicle; a determination module for determining a first light source element in the backlight source of a head-up display device corresponding to a content sub-area in a head-up display screen; and a control module for controlling the switching state of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity, so that the content sub-area is at a target display brightness.

[0006] In a third aspect, the present application provides a head-up display system, which includes: a display device, a backlight source and a backlight control device; wherein the backlight control device is used to execute the backlight control method described in any one of the embodiments of the present application.

[0007] In a fourth aspect, the present application provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores one or more computer programs executable by the at least one processor, and one or more of the computer programs are executed by the at least one processor to enable the at least one processor to execute the above-mentioned backlight control method.

[0008] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the above-mentioned backlight control method when executed by a processor / processing core.

[0009] In the embodiment provided by the present application, when the ambient light intensity of the vehicle is obtained, in order to enable the head-up display device to provide a virtual image brightness that matches the ambient light intensity, for the content sub-region containing actual display content in the head-up display screen, the first light source element in the backlight source of the head-up display device corresponding to the content sub-region is first determined, and the switching state of the first light source element and the second light source element that is closer to the first light source element is controlled according to the ambient light intensity. The content sub-region is provided with light by the turned-on first light source element and / or the second light source element, so that the content sub-region is at a target display brightness that is more closely matched to the ambient light intensity. In other words, in the embodiment of the present application, the influence of the neighboring light source elements on the display brightness of the current region is utilized. When the ambient light intensity is determined, in addition to controlling the switching state of the light source element of the current region (i.e., the first light source element), the switching state of the neighboring light source elements (i.e., the second light source element) is also controlled, thereby expanding the adjustable range of the display brightness of the current region, thereby providing a target display brightness that is more closely matched to the ambient light intensity and improving the user experience.

[0010] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. The above and other features and advantages will become more apparent to those skilled in the art by describing the detailed exemplary embodiments with reference to the accompanying drawings. In the accompanying drawings:

[0012] Figure 1 A schematic structural diagram of a head-up display system provided in an embodiment of the present application.

[0013] Figure 2This is a flowchart of a backlight control method provided in an embodiment of the present application.

[0014] Figure 3 A schematic diagram of a content sub-area provided in an embodiment of the present application.

[0015] Figure 4 A schematic diagram of a backlight source and a head-up display screen provided in an embodiment of the present application.

[0016] Figure 5 A schematic diagram of an adjustable range of display brightness of a head-up display provided in an embodiment of the present application.

[0017] Figure 6 A schematic diagram of a display area array provided in an embodiment of the present application.

[0018] Figure 7 A schematic diagram of a display area array provided in an embodiment of the present application.

[0019] Figure 8 This is a block diagram of a backlight control device provided in an embodiment of the present application.

[0020] Figure 9 A block diagram of a head-up display system provided in an embodiment of the present application.

[0021] Figure 10 A block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] To help those skilled in the art better understand the technical solutions of the present application, the following description of exemplary embodiments of the present application is provided in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0023] In the absence of conflict, the various embodiments of the present application and the various features therein may be combined with each other.

[0024] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The terms used herein are only used to describe specific embodiments and are not intended to limit this application. As used herein, the singular forms "a" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded. Similar words such as "connected" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this application, and will not be interpreted as having an idealized or overly formal meaning unless expressly defined as such herein.

[0027] The head-up display system, also known as a head-up display device, projects the image light emitted by the HUD image source onto an imaging window (for example, an imaging plate or a vehicle's windshield, etc.), forming a virtual image in front of the imaging window. This allows the user to directly see the virtual image without having to lower their head, thereby improving the user's driving experience.

[0028] Figure 1 This is a schematic diagram of the structure of a head-up display system provided in an embodiment of the present application. Figure 1 As shown, the head-up display system includes an image source and an amplifying element. The image source includes a display panel and a backlight module. The display panel can be a liquid crystal display (LCD) panel, and the backlight module, i.e., the backlight source, includes multiple light source elements, which can be light-emitting diodes (LEDs).

[0029] Exemplarily, the backlight module is used to provide backlight for the display panel. The light source light emitted by the backlight module is incident on the display panel, converted into image light by the display panel (so that the display panel can display an image) and emitted from the display panel. The image light emitted by the display panel is incident on the magnifying element. The magnifying element is used to amplify the image light and form an image. The magnifying element can be a curved reflector (for example, a free-form reflector), or an optical waveguide or a holographic optical element (HOE). After being processed by the magnifying element, the image light emitted by the display panel reaches the imaging window, and after being reflected by the imaging window, it reaches the eye box area, thereby forming a virtual image, namely the head-up display screen. When the user's eyes are located in the eye box area, the virtual image located in front of the imaging window can be viewed.

[0030] As a head-up display (HUD), similar to other displays, it also has a brightness parameter. This brightness can be understood as the brightness of the virtual image or the brightness of the head-up display. The HUD also needs to provide appropriate display brightness in different environments. For example, in bright environments such as sunlight, it needs to provide a higher display brightness to ensure that the user can see a clear virtual image. In low ambient light conditions (such as in a dark basement or at night), it needs to provide a lower display brightness to avoid glare and other adverse viewing experiences.

[0031] Currently, the brightness adjustment range of a HUD is typically fixed, for example, 100 to 12,000 nits. However, in actual use, this brightness adjustment range cannot meet user needs in certain environments. For example, on a sunny day, even with the HUD brightness adjusted to the highest setting of 12,000 nits, the virtual image is still difficult to see clearly when driving towards the sun. In dark environments, even with the HUD brightness adjusted to the lowest setting of 100 nits, the image is still somewhat glaring.

[0032] In related technologies, extending the brightness range is usually achieved by extending power consumption. For example, the power consumption of the backlight module can be increased to increase the power consumption of the LED. When the brightness of the LED is increased, the brightness of the virtual image is also increased. However, this method may bring the risk of increased power consumption. In addition, the brightness of the virtual image can be reduced by adjusting the duty cycle, where the duty cycle is the ratio of the time that the LED is in the on and off state within a cycle, and the lower the duty cycle, the smaller the luminous flux output by the LED, the lower the LED brightness, and the corresponding lower the brightness of the virtual image. However, when the duty cycle is too small, it may bring risks such as screen flickering.

[0033] In view of this, embodiments of the present application provide a backlight control method, a backlight control device, a head-up display system, an electronic device, and a computer-readable storage medium.

[0034] According to the backlight control method of the embodiment of the present application, the influence of the neighboring light source elements on the display brightness of the current area can be utilized. When the ambient light intensity is determined, in addition to controlling the on / off state of the light source element of the current area (i.e., the first light source element), the on / off state of the neighboring light source element (i.e., the second light source element) is also controlled, thereby expanding the adjustable range of the display brightness of the current area, thereby providing a target display brightness that is more closely matched with the ambient light intensity, and improving the user experience.

[0035] According to the embodiment of the present application, the backlight control method can be executed by an electronic device such as a control device in the HUD (such as a control chip) or a control system in a vehicle (such as a vehicle control system), and the method can be implemented by a processor calling computer-readable program instructions stored in a memory.

[0036] In a first aspect, an embodiment of the present application provides a backlight control method.

[0037] Figure 2 This is a flow chart of a backlight control method provided in an embodiment of the present application. Figure 2 , the method may include the following steps.

[0038] In step S21 , the ambient light intensity of the vehicle is obtained.

[0039] In step S22 , a first light source element in a backlight source of a head-up display device corresponding to a content sub-region in a head-up display screen is determined.

[0040] In step S23 , the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold are controlled to switch states according to the ambient light intensity, so that the content sub-area is at the target display brightness.

[0041] In an embodiment of the present application, when the ambient light intensity of the vehicle is obtained, in order to enable the head-up display device to provide a virtual image brightness that matches the ambient light intensity, for a content sub-region containing actual display content in the head-up display screen, the first light source element in the backlight source of the head-up display device corresponding to the content sub-region is first determined, and then, based on the ambient light intensity, the on / off state of the first light source element and a second light source element that is closer to the first light source element is controlled. The content sub-region is illuminated by the first light source element and / or the second light source element being turned on, so that the content sub-region is at a target display brightness that is more closely matched to the ambient light intensity. In other words, in an embodiment of the present application, the influence of neighboring light source elements on the display brightness of the current region is utilized. When the ambient light intensity is determined, in addition to controlling the on / off state of the light source element in the current region (i.e., the first light source element), the on / off state of the neighboring light source element (i.e., the second light source element) is also controlled, thereby expanding the adjustable range of the display brightness of the current region, thereby providing a target display brightness that is more closely matched to the ambient light intensity and improving the user experience.

[0042] In some optional implementations, a vehicle refers to a means of transportation that can carry out freight or passenger transportation, which can be a vehicle, a ship, or other tool, and the embodiments of the present application do not limit this.

[0043] In some optional implementations, the ambient light intensity of the vehicle refers to the light intensity of the environment in which the vehicle is located, and can be represented using light intensity units such as candela and nit.

[0044] In some optional implementations, obtaining the ambient light intensity of the vehicle includes: obtaining a target field of view image of the vehicle; and determining the ambient light intensity based on the target field of view image. The target field of view image may include an image within a field of view in front of a driver of the vehicle.

[0045] For example, a camera mounted on the vehicle can capture an image of the vehicle's target field of view, which can then be recognized by a preset processor to determine the ambient light intensity within the vehicle's target field of view. The target field of view image can be an image corresponding to the driver's field of view, and the target field of view image typically includes multiple pixels, each of which corresponds to a pixel light intensity. The ambient light intensity can be the average of the light intensities of the multiple pixels corresponding to the target field of view image.

[0046] It should be noted that, under normal circumstances, if the ambient light intensity is stronger, the display brightness of the head-up display should also be correspondingly stronger, so as to present a clear display effect to the user. Conversely, if the ambient light intensity is weaker, the display brightness of the head-up display should also be correspondingly lower so as not to be dazzling and present a comfortable display effect to the user.

[0047] Based on this, in step S12 and step S13, the first light source element in the backlight source of the head-up display device corresponding to the content sub-area in the head-up display screen can be determined, and the switching states of the first light source element and the second light source element whose distance from the first light source element is less than a preset distance threshold can be controlled to make the content sub-area at the target display brightness matching the ambient light intensity, thereby providing the user with a clear and comfortable head-up display effect.

[0048] In some optional implementations, a head-up display device includes a display panel and a backlight, wherein the backlight is used to provide illumination for the display panel. For example, the backlight includes multiple light source elements. When turned on, the light source elements emit light. This light is incident on the display panel, processed by the display panel, converted into image light, and emitted from the display panel. After processing by other functional modules, it presents a head-up display image. In other words, the head-up display image is the display image provided to the user by the head-up display system.

[0049] It should be noted that, for the head-up display screen, most areas can be perspective areas that do not display content, and only a small number of areas are set with display content. Areas with different display content correspond to different content sub-areas. In other words, the content sub-area is the sub-area in the head-up display screen where actual display content exists. The display content corresponding to each content sub-area can be a corresponding display logo, display text, etc., which is not limited in the embodiments of the present application. In addition, when adjusting the backlight, a local control method can be adopted, wherein the local control method can perform corresponding backlight control on one or more content sub-areas (for example, backlight control is performed on multiple content sub-areas belonging to the same content type; for example, backlight control is performed separately for each content sub-area). This is not limited in the embodiments of the present application.

[0050] In some optional implementations, the content sub-area is a sub-area corresponding to a user interface (UI) element in a head-up display. A user interface element refers to a series of elements included in a system interface configured to meet information interaction requirements in a head-up display system, and may include instrument interface elements, voice assistant interface elements, navigation interface elements, etc., although this embodiment of the present application does not impose any limitation thereto.

[0051] In some optional implementations, multiple content sub-regions of a head-up display can be determined based on user interface information corresponding to the head-up display. The user interface information refers to information about the pre-designed display interface of the head-up display system. Multiple different content types can be configured within the user interface, and one or more user interface elements can be configured for each content type. The user interface information can also include information such as the position, size, and shape of each user interface element. Therefore, multiple content sub-regions can be determined based on the user interface information.

[0052] For example, based on the user interface information of the head-up display screen, content sub-areas corresponding to instrument information, voice assistant information, turn-by-turn (TBT) navigation information, points of interest (POI) information, and preceding vehicle prompt information can be determined.

[0053] In some optional implementations, the head-up display screen corresponds to multiple sub-display areas, and the content sub-area corresponds to at least one sub-display area. By dividing the head-up display screen into multiple sub-display areas, the sub-display area corresponding to the content sub-area can be determined, and the corresponding first light source element can be further determined based on these sub-display areas.

[0054] Figure 3 A schematic diagram of a content sub-area provided in an embodiment of the present application. Figure 3 The head-up display screen is divided into multiple sub-display areas, among which the user interface element "15km / h" is a content sub-area, which corresponds to two sub-display areas (i.e., the second sub-display area and the third sub-display area in the second row).

[0055] In some optional implementations, the backlight source includes multiple light source elements, and the sub-display area corresponds to at least one light source element in the backlight source, and the display brightness of the sub-display area can be provided by the corresponding light source element.

[0056] For example, a head-up display screen of a head-up display device can be divided into multiple sub-display areas, each corresponding to a light source element in a backlight source. For example, the head-up display device includes a liquid crystal display (LCD). The LCD display screen is magnified and imaged to produce the head-up display screen. Therefore, there is a correspondence between the LCD display screen and the head-up display screen, and each sub-display area of ​​the head-up display screen can correspond to a small display area of ​​the LCD screen. Based on this, by analyzing the video image signal input to the LCD screen, it is possible to determine which display areas of the LCD screen display content is displayed, and the sub-display areas of the head-up display screen corresponding to these displayed contents are determined. Based on these sub-display areas, the corresponding content sub-areas can be determined, and then the first light source element corresponding to each content sub-area can be determined.

[0057] In some optional implementations, the display panel can be divided into multiple sub-regions, each corresponding to a light source element in the backlight source. By analyzing the video image signal input to the display panel, it is possible to determine which sub-regions of the display panel display content is displayed. The sub-regions displaying content are the regions corresponding to the content sub-regions in the head-up display. Based on this, the first light source element corresponding to each content sub-region in the head-up display can be determined based on the sub-regions of the display panel corresponding to each content sub-region and the light source element corresponding to each sub-region.

[0058] In some optional implementations, the backlight source is configured in a local dimming mode. In other words, when content is displayed in a certain area (for example, a content sub-area), the switch of the light source element corresponding to this area is turned on to illuminate the light source element. When no content is displayed in a certain area, the switch of the light source element in this area is turned off to extinguish the light source element. For a head-up display device, most of the display area of ​​the display panel (for example, an LCD screen) is a black area with no content (i.e., a see-through area). This see-through area does not actually need to turn on the backlight. Therefore, the backlight can be turned on only for the content sub-area where content is displayed, thereby reducing power consumption.

[0059] Exemplarily, one sub-display area corresponds to one light source element, and each light source element can be dimmed individually.

[0060] Figure 4 This is a schematic diagram of a backlight source and a head-up display provided in an embodiment of the present application. Figure 4The backlight source includes a plurality of light source elements arranged in an array. The backlight source is used to provide illumination for a preset display panel, enabling the display panel to display an image. The image light emitted by the display panel ultimately forms a head-up display. The head-up display is divided into a plurality of sub-display areas arranged in an array, and each sub-display area corresponds to a light source element. The light source element provides backlight for the corresponding sub-display area (specifically, the light source element provides backlight for the sub-display area corresponding to the sub-display area within the display area of ​​the display panel). In step S12, determining the first light source element can actually be understood as determining the light source element corresponding to the location of the content sub-area of ​​the head-up display.

[0061] In some optional implementations, determining a first light source element in a backlight source of a head-up display device that corresponds to a content sub-area in a head-up display screen includes: determining a first sub-display area corresponding to a content sub-area in the head-up display screen; and determining a first light source element in the backlight source of the head-up display device that corresponds to the first sub-display area.

[0062] It should be noted that, in the related art, the display brightness of the content sub-area is usually adjusted only by adjusting the on / off state and the luminous brightness of the first light source element. In the present application, it is taken into account that in the backlight display technology, the light emitted by each light source element is not completely collimated when it is incident on the display panel (when it is completely collimated, the light is incident on the display panel at the same incident angle (for example, vertical incidence). In this case, the light emitted by each light source element will only be incident on the sub-area corresponding to it in the display panel, and will not be incident on other sub-areas. Through optical design, the backlight emitted by the backlight source is incident on the display panel in a collimated manner, which can improve the utilization rate of the light. Due to the limitations of actual application scenarios (such as the processing technology of the components, installation errors and other factors), the light is usually not completely collimated, that is, most of the light is collimated, and a small part of the light is non-collimated. This small part of the light will be incident on the sub-area surrounding the sub-area corresponding to the light source element in the display panel). Therefore, the sub-area that can be illuminated by each light source element is actually larger than the sub-area it corresponds to. Equivalently, the area in the head-up display screen that can be illuminated by each light source element is actually larger than the sub-display area it corresponds to, and it can also provide a certain brightness to the surrounding sub-display areas. Based on this, in an embodiment of the present application, after determining the first light source element corresponding to the content sub-area, the illumination influence of the content sub-area by the surrounding light source elements (i.e., the second light source element) is further utilized. By controlling the switching states of the first light source element and the second light source element, the adjustable range of the display brightness of the content sub-area is increased, so that the content sub-area displays a target display brightness that is more matched with the ambient light intensity.

[0063] In some optional implementations, the switching states of a first light source element and a second light source element whose distance to the first light source element is less than a preset distance threshold are controlled according to the ambient light intensity so that the content sub-area is at the target display brightness, including: when the ambient light intensity is greater than or equal to the first preset light intensity threshold, determining that the switching states of the first light source element and at least one second light source element are both on; when the ambient light intensity is less than or equal to the second preset light intensity threshold, determining that the switching state of the first light source element is off, and determining that the switching state of at least one second light source element is on; and controlling the switching of the first light source element and the second light source element according to the determined switching states; wherein the second preset light intensity threshold is less than the first preset light intensity threshold.

[0064] In some optional implementations, the second light source element includes a light source element adjacent to the first light source element, with a small distance between the two, so that at least a portion of the light from the second light source element can be incident on the content sub-region. If the distance between the two is too large, the light from the second light source element cannot be incident on the content sub-region, and even controlling the on / off state of the second light source element cannot effectively adjust the display brightness of the content sub-region.

[0065] In some optional implementations, the preset distance threshold is the distance between two adjacent light source elements. Accordingly, the second light source element includes a light source element adjacent to the first light source element.

[0066] In some optional implementations, the preset distance threshold is equal to the occupied length of one light source element, and accordingly, the second light source element includes two light source elements adjacent to the first light source element.

[0067] It should be noted that as the distance between the first light source element and the second light source element increases, the light that can be incident from the second light source element on the sub-display area corresponding to the first light source element decreases, and its contribution to the display brightness of the sub-display area corresponding to the first light source element also decreases accordingly.

[0068] It should also be noted that the above preset distance threshold is only an example, and the embodiments of the present application do not limit this.

[0069] In summary, when the ambient light intensity is strong, in order to further increase the display brightness of the content sub-region, in addition to turning on the first light source element corresponding to the content sub-region, at least one second light source element may also be turned on. For the content sub-region, the incident light includes not only the light emitted by the first light source element but also a portion of the light emitted by the turned-on second light source element. Therefore, the display brightness of the content sub-region can be further increased, bringing it to a target display brightness that closely matches the ambient light intensity. When the ambient light intensity is weak, in order to further reduce the display brightness of the content sub-region, instead of turning on the first light source element corresponding to the content sub-region, at least one surrounding second light source element may be turned on. The portion of light from the second light source element that enters the content sub-region provides display brightness for the content sub-region. Compared to turning on only the first light source element, the display brightness of the content sub-region can be further reduced, bringing it to a target display brightness that closely matches the ambient light intensity.

[0070] Figure 5 A schematic diagram of an adjustable range of display brightness of a head-up display provided in an embodiment of the present application. Figure 5 , with the duty cycle as the horizontal axis and the display brightness of the head-up display as the vertical axis, the adjustable range of the display brightness can be plotted.

[0071] In related technologies, considering that the duty cycle typically cannot be less than 1% and has a maximum value of 100%, the adjustable range of display brightness can be determined to be [x1, x2]. For a content sub-region, when the duty cycle of its corresponding first light source element is 1%, the display brightness of the content sub-region is the lowest, at x1; when the duty cycle of its corresponding first light source element is 100%, the display brightness of the content sub-region is the highest, at x2.

[0072] In the embodiment of the present application, the display brightness of the content sub-region is not only related to the first light source element, but also to the adjacent second light source element. Therefore, in some cases (e.g., low ambient light intensity), the first light source element can be turned off and at least one second light source element can be turned on. The light transmitted to the content sub-region by the turned-on second light source element causes the content sub-region to exhibit a display brightness lower than x1, thereby reducing the minimum display brightness of the content sub-region from x1 to x3 (x3 < x1). In some cases (e.g., high ambient light intensity), in addition to turning on the first light source element and increasing its duty cycle, at least one second light source element can be turned on. The light emitted by the first light source element and the light transmitted to the content sub-region by the turned-on second light source element can be used to jointly illuminate the content sub-region, causing the content sub-region to exhibit a display brightness higher than x2, thereby increasing the maximum display brightness of the content sub-region from x2 to x4 (x2 < x4). In summary, without changing the hardware structure such as the backlight source, the adjustable range of the display brightness of the content sub-area can be expanded from [x1, x2] to [x3, x4], so that the content sub-area can present a target display brightness that better matches the ambient light intensity.

[0073] Further, for Figure 3 In the content sub-area shown, if only two first light source elements are turned on, at a 100% duty cycle, its maximum display brightness is generally 12000 nits; if the method of the embodiment of the present application is adopted, while the two first light source elements are turned on, the 10 second light source elements around them are turned on at the same time, then the display brightness of the content sub-area can be increased to 14000 nits or even higher. Similarly, if the two first light source elements are turned on, at a 1% duty cycle, the minimum display brightness of the content sub-area is generally 100 nits; if the method of the embodiment of the present application is adopted, instead of turning on the two first light source elements, the two second light source elements on the left and right sides of the first light source elements are turned on, then the display brightness can be reduced to 10 nits or even lower. It can be seen from this that the backlight control method of the embodiment of the present application can expand the display brightness range of the HUD without adjusting the hardware structure and changing the hardware power consumption, and can provide matching display brightness for a variety of environments, thereby improving the driver's viewing experience.

[0074] In some optional implementations, controlling the on / off states of a first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold based on ambient light intensity includes: determining the on / off states of the first light source element and the second light source element based on the ambient light intensity and a preset correspondence; and controlling the on / off states of the first light source element and the second light source element based on the determined on / off states so that the content sub-region is at a target display brightness that matches the ambient light intensity; wherein the preset correspondence is a correspondence between the ambient light intensity, the target display brightness of the content sub-region, and light source element information. The light source element information is information about the first light source element and the second light source element.

[0075] From this, it can be seen that a preset correspondence can be established in advance, in which the correspondence between the ambient light intensity, the target display brightness of the content sub-area and the light source element information is defined. Based on this, when the ambient light intensity is determined, the light source element information corresponding to the ambient light intensity can be determined according to the preset correspondence, and the switching status of the first light source element and the second light source element can be determined according to the light source element information. After controlling the switching of the first light source element and the second light source element according to the switching status, the content sub-area can be made to present the target display brightness.

[0076] In some optional implementations, determining the on / off states of the first and second light source elements based on ambient light intensity and a preset correspondence includes: determining the on / off state of the first light source element as on when the ambient light intensity is greater than or equal to a first preset light intensity threshold, or determining the on / off state of the first light source element as off when the ambient light intensity is less than or equal to a second preset light intensity threshold; and determining a first target light source element from the second light source elements based on the ambient light intensity and the preset correspondence, and determining the on / off state of the first target light source element as on and the off / off state of the second target light source element as off. The second target light source element is a light source element in the second light source elements other than the first target light source element.

[0077] As mentioned above, when the ambient light intensity is strong, in order to further improve the display brightness of the content sub-area, in addition to turning on the first light source element corresponding to the content sub-area, it is also necessary to turn on at least one second light source element (i.e., the first target light source element); when the ambient light intensity is weak, in order to further reduce the display brightness of the content sub-area, it is necessary not to turn on the first light source element corresponding to the content sub-area, but to turn on at least one second light source element (i.e., the first target light source element) in the surrounding area.

[0078] It can be seen that, for the on / off state of the first light source element, if the ambient light intensity is greater than or equal to the first preset light intensity threshold, it means that the ambient light intensity is high, therefore, it is determined that the first light source element needs to be turned on; if the ambient light intensity is less than or equal to the second preset light intensity threshold, it means that the ambient light intensity is low, therefore, it is determined that the first light source element needs to be turned off. For the on / off state of the second light source element, the first target light source element that needs to be turned on can be determined from the second light source elements based on the ambient light intensity and the preset correspondence, and the on / off state of the second target light source element is determined to be off, so that the turned-on first target light source element can provide a certain amount of illumination for the content sub-area, thereby further improving the display brightness of the content sub-area when the ambient light intensity is high, and replacing the first light source element to provide a lower display brightness for the content sub-area when the ambient light intensity is low.

[0079] Figure 6 A schematic diagram of a display area array provided in an embodiment of the present application shows a 3×4 display area array.

[0080] Reference Figure 6 In a, the two sub-display areas located in the center of the display area array are the sub-display areas corresponding to the content sub-area, and these two sub-display areas correspond to two first light source elements; the 10 sub-display areas adjacent to the content sub-area correspond to 10 light source elements respectively, and these 10 light source elements belong to the second light source elements. For example, when the ambient light intensity is greater than or equal to the first preset light intensity threshold, it is determined by the ambient light intensity that all the second light source elements are first target light source elements, and their switch states should be on. Based on this, the switch states of the two first light source elements and the 10 first target light source elements are controlled to be on. For the content sub-area, its illumination source includes not only the two first light source elements (corresponding to the solid arrows), but also part of the light incident from the 10 first target light source elements surrounding the first light source element (corresponding to the dotted arrows). Compared with only controlling the first light source element to be turned on, controlling the first light source element and the 10 first target light source elements to be turned on can improve the display brightness of the content sub-area.

[0081] Reference Figure 6In b, the two sub-display areas located in the center of the display area array are the sub-display areas corresponding to the content sub-area, and these two sub-display areas correspond to two first light source elements; the 10 sub-display areas adjacent to the content sub-area correspond to 10 light source elements respectively, and these 10 light source elements belong to the second light source elements. When the ambient light intensity is greater than or equal to the first preset light intensity threshold, the 4 second light source elements located at the four corners are determined to be the second target light source elements by the ambient light intensity, and the remaining 6 second light source elements are the first target light source elements. Based on this, the switch states of the 2 first light source elements and the 6 first target light source elements are controlled to be on. For the content sub-area, its illumination source includes not only the two first light source elements (corresponding to the solid arrows), but also part of the light incident from the 6 first target light source elements surrounding the first light source element (corresponding to the dotted arrows). Compared with only controlling the first light source element to be turned on, controlling the 2 first light source elements and the 6 first target light source elements to be turned on can improve the display brightness of the content sub-area.

[0082] Figure 7 A schematic diagram of a display area array provided in an embodiment of the present application shows a 3×4 display area array.

[0083] Reference Figure 7 In a, the two sub-display areas located at the center of the display area array are the sub-display areas corresponding to the content sub-area, and these two sub-display areas correspond to two first light source elements; the 10 sub-display areas adjacent to the content sub-area each correspond to 10 light source elements, and these 10 light source elements are second light source elements. When the ambient light intensity is less than or equal to the second preset light intensity threshold, one of the second light source elements is determined to be the first target light source element based on the ambient light intensity, and its switch state should be on. For example, any second light source element among the ten second light source elements adjacent to the two first light source elements is determined to be the first target light source element ( Figure 7 a only shows the case where the second light source element in the first column and second row is used as the first target light source element). Based on this, the switch states of the two first light source elements are controlled to be off, and the switch state of the first target light source element is controlled to be on. For the content sub-area, its light source only includes part of the light incident from a first target light source element (corresponding to the dotted arrow). Since the light incident on the content sub-area only includes a part of the light from the first target light source element (non-collimated part of the light), the intensity of this part of the light is less than the light intensity when the first light source element is turned on. Therefore, the display brightness that can be provided by the first target light source element is less than the display brightness that can be provided by the first light source element when it is turned on. It can be seen that compared to controlling only the first light source element to be turned on, controlling a first target light source element to be turned on can reduce the display brightness of the content sub-area.

[0084] Reference Figure 7 In b, the two sub-display areas located at the center of the display area array are the sub-display areas corresponding to the content sub-area, and these two sub-display areas correspond to two first light source elements; the 10 sub-display areas adjacent to the content sub-area each correspond to 10 light source elements, and these 10 light source elements are second light source elements. When the ambient light intensity is less than or equal to the second preset light intensity threshold, the two second light source elements are determined as the first target light source elements based on the ambient light intensity, and the remaining 8 second light source elements are determined as the second target light source elements ( Figure 7 b only shows the case where the second light source element in the first column and the second row and the second light source element in the third column and the second row are used as the first target light source elements). Based on this, the switch states of the two first light source elements and the eight second target light source elements are controlled to be off, and the switch states of the two first target light source elements are controlled to be on. For the content sub-area, its illumination source only includes part of the light incident from the two first target light source elements (corresponding to the dotted arrows). Compared with controlling only the first light source element to be turned on, controlling the two first target light source elements to be turned on can reduce the display brightness of the content sub-area.

[0085] The preset corresponding relationship and how to determine the on / off states of the first light source element and the second light source element based on the preset corresponding relationship will be described in detail below.

[0086] In some optional implementations, in the preset correspondence, the light source element information may include at least one of the following: the total number of activated light source elements, the positions of activated second light source elements, and the target luminous brightness of the activated light source elements. The total number of activated light source elements refers to the number of activated light source elements required to achieve a target display brightness matching the ambient light intensity for the content sub-area; the positions of activated second light source elements refer to the positions of the activated second light source elements required to be located; and the target luminous brightness of the activated light source elements refers to the luminous brightness required for the activated light source elements to achieve a target display brightness matching the ambient light intensity for the content sub-area.

[0087] In some optional implementations, the light source element information includes the total number of turned-on light source elements; accordingly, determining the first target light source element that needs to be turned on from the second light source elements includes: determining the first total number of turned-on light source elements corresponding to the target display brightness based on the ambient light intensity and a preset correspondence; when the ambient light intensity is greater than or equal to a first preset light intensity threshold, determining the first number of first target light source elements based on the difference between the first total number and the number of first light source elements, or, when the ambient light intensity is less than or equal to the second preset light intensity threshold, determining the first number of first target light source elements based on the first total number; and selecting the first target light source element from the second light source elements based on the first number of the first target light source elements.

[0088] In other words, the preset correspondence is the relationship between the ambient light intensity, the target display brightness of the content sub-area, and the total number of light source elements to be enabled. Once the ambient light intensity is determined, the preset correspondence can be used to determine the total number of light source elements to be enabled. This, in turn, can be used to determine the number of first and second light source elements to be enabled based on this total number and the ambient light intensity.

[0089] In some optional implementations, the preset correspondence relationship may be represented in the form of a table. Table 1 exemplarily shows a preset correspondence relationship.

[0090] Table 1 Schematic table of preset correspondence

[0091]

[0092]

[0093] As shown in Table 1, it shows the preset corresponding relationship between the content sub-regions S1, ..., and the content sub-region Sv, where v≥1, and v is the sequence number of the content sub-region.

[0094] For the content sub-area S1, when the ambient light intensity is L1, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D1, and the total number of light source elements that need to be turned on for the target display brightness is N11; when the ambient light intensity is L2, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, and the total number of light source elements that need to be turned on for the target display brightness is N12; ...; when the ambient light intensity is Lm, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_Dm, and the total number of light source elements that need to be turned on for the target display brightness is N1m, where m represents the gear of the ambient light intensity, and m≥1.

[0095] Similarly, for the content sub-region Sv, when the ambient light intensity is L1, the target display brightness that matches the content sub-region Sv with the ambient light intensity is determined to be Sv_D1, and the total number of light source elements that need to be turned on for this target display brightness is Nv1; when the ambient light intensity is L2, the target display brightness that matches the content sub-region Sv with the ambient light intensity is determined to be Sv_D2, and the total number of light source elements that need to be turned on for this target display brightness is Nv2; ...; when the ambient light intensity is Lm, the target display brightness that matches the content sub-region Sv with the ambient light intensity is determined to be Sv_Dm, and the total number of light source elements that need to be turned on for this target display brightness is Nvm. Where v represents the sequence number of the content sub-region and v ≥ 1.

[0096] Assuming the ambient light intensity is Li (1≤i≤m), for any content sub-region Sr (1≤r≤v), when determining the first target light source element to be activated from the second light source elements, a first total number Nri of activated light source elements corresponding to the target display brightness Sr_Di matching the ambient light intensity Li for the content sub-region Sr can be determined based on the ambient light intensity Li and a preset correspondence. Furthermore, if the ambient light intensity is greater than or equal to a first preset light intensity threshold, it indicates that the ambient light intensity is high, requiring activation of the first light source element and at least one second light source element. Therefore, a first number n2 of the first target light source elements (n2=Nri-n1) can be determined based on the difference (Ni-n1) between the first total number Nri and the number n1 of the first light source elements. Conversely, if the ambient light intensity is less than or equal to the second preset light intensity threshold, it indicates that the ambient light intensity is low, requiring activation of the first light source element, and only activation of a number of the second light source elements is sufficient. Therefore, the determined first total number Nri is the first number n2' of the first target light source elements to be activated (n2'=Nri). After determining how many second light source elements need to be turned on, a corresponding number of second light source elements can be selected from the second light source elements as first target light source elements, and the remaining second light source elements that do not need to be turned on are second target light source elements.

[0097] In some optional implementations, the light source element information includes the position of an activated second light source element; accordingly, determining the first target light source element to be activated from the second light source elements includes: determining the position of the activated second light source element corresponding to the target display brightness based on the ambient light intensity and a preset correspondence; and determining the first target light source element based on the position of the activated second light source element. The position of the activated second light source element can be represented using coordinate data, position description data, etc., which is not limited in this embodiment of the present application.

[0098] It should be noted that, when the positions of the second light source elements to be turned on are clarified, it is equivalent to clarifying the positions of the second light source elements that need to be turned on, that is, clarifying the number of second light source elements that need to be turned on.

[0099] In other words, the preset correspondence can also be a correspondence between the ambient light intensity, the target display brightness of the content sub-area, and the position of the activated second light source element. Once the ambient light intensity is determined, the preset correspondence can be used to determine which second light source element to activate. Furthermore, the ambient light intensity can be used to determine whether the first light source element should be activated. This determines the on / off status of the first and second light source elements, and on / off control can be performed based on the determined on / off status.

[0100] Table 2 exemplarily shows a preset corresponding relationship.

[0101] Table 2 Preset correspondence diagram

[0102] Ambient light intensity Target display brightness Position of the second light source element turned on L1 S1_D1 (x11,y11)(x12,y12) L2 S1_D2 (x11,y11)(x13,y13) L3 S1_D3 (x11,y11)(x12,y12)(x13,y13) …… …… …… Ln S1_Dn (x11,y11)…(x1k,y1k) …… …… …… L1 Sv_D1 (xv1,yv1)(xv3,yv3) L2 Sv_D2 (xv2,yv2)(xv3,yv3) …… …… …… Ln Sv_Dn (xv2,yv2)…(xvk,yvk)

[0103] As shown in Table 2, the position of the turned-on second light source element is represented by coordinate data (x, y), where x represents the horizontal coordinate distance of the second light source element from the preset origin, and y represents the vertical coordinate distance of the second light source element from the preset origin. Table 2 shows the preset correspondence between content sub-areas S1, ..., and content sub-area Sv, where v ≥ 1, and v is the serial number of the content sub-area.

[0104] For the content sub-area S1, when the ambient light intensity is L1, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D1, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x12, y12); when the ambient light intensity is L2, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x13, y13); when the ambient light intensity is L3, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x13, y13); The target display brightness that matches the ambient light intensity of domain S1 is S1_D3, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11), (x12, y12) and (x13, y13); ...; when the ambient light intensity is Ln, the target display brightness that matches the content sub-area S1 is determined to be S1_Dn, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11)...(x1k, y1k), where n represents the gear of the ambient light intensity, n≥1, and k is the serial number identifier of the second light source element, k>1.

[0105] By analogy, for the content sub-area Sv, when the ambient light intensity is L1, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D1, and the positions of the second light source elements that need to be turned on for the target display brightness are (xv1, yv1) and (xv3, yv3); when the ambient light intensity is L2, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (xv2, yv2) and (xv3, yv3); ...; when the ambient light intensity is Ln, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_Dn, and the positions of the second light source elements that need to be turned on for the target display brightness are (xv2, yv2)...(xvk, yvk).

[0106] Assuming the ambient light intensity is Lj (1≤j≤n), for any content sub-area Sr (1≤r≤v), when determining the first target light source element to be turned on from the second light source elements, the position of the turned-on second light source element corresponding to the target display brightness Sv_Dj that matches the content sub-area Sr with the ambient light intensity Lj can be determined based on the ambient light intensity Lj and a preset correspondence. Furthermore, if the ambient light intensity is greater than or equal to a first preset light intensity threshold, it indicates that the ambient light intensity is high and the first light source element and at least one second light source element need to be turned on. Therefore, the switch state of the first light source element can be determined to be on, and based on the position of the corresponding turned-on second light source element, the second light source element to be turned on can be determined. These second light source elements are the first target light source elements, and the remaining second light source elements that do not need to be turned on are the second target light source elements. If the ambient light intensity is less than or equal to the second preset light intensity threshold, it means that the ambient light intensity is low, and there is no need to turn on the first light source element. Only some of the second light source elements need to be turned on. Therefore, it can be determined that the switch state of the first light source element is off, and based on the position of the corresponding turned-on second light source element, the second light source element that needs to be turned on is determined. This part of the second light source elements is the first target light source element, and the remaining second light source elements that do not need to be turned on are the second target light source elements.

[0107] In some optional implementations, the light source element information may also include the target luminous brightness of the turned-on light source element; accordingly, after determining the first target light source element that needs to be turned on from the second light source elements, the method may also include: controlling the luminous brightness of the first light source element and the first target light source element in the turned-on state to be the target luminous brightness.

[0108] In other words, in some optional implementations, the preset correspondence may also be a correspondence between ambient light intensity, target display brightness of the content sub-region, the total number of enabled light source elements, and the target luminous brightness of the enabled light source elements. Table 3 exemplifies one preset correspondence.

[0109] Table 3 Preset correspondence diagram

[0110] Ambient light intensity Target display brightness The total number of light source components that are turned on Target luminous brightness L1 S1_D1 N11 B11 L2 S1_D2 N12 B12 …… …… …… …… Lp S1_Dp N1p B1p …… …… …… …… L1 Sv_D1 Nv1 Bv1 L2 Sv_D2 Nv2 Bv2 …… …… …… …… Lp Sv_Dp Nvp Bvp

[0111] As shown in Table 3, for the content sub-area S1, when the ambient light intensity is L1, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D1, the total number of light source elements that need to be turned on for the target display brightness is N11, and the luminous brightness of the N11 light source elements after being turned on is the target luminous brightness B11; when the ambient light intensity is L2, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, the total number of light source elements that need to be turned on for the target display brightness is N12, and the luminous brightness of the N12 light source elements after being turned on is the target luminous brightness B12; ...; when the ambient light intensity is Lp, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_Dp, the total number of light source elements that need to be turned on for the target display brightness is N1p, and the luminous brightness of the N1p light source elements after being turned on is the target luminous brightness B1p, where p represents the level of the ambient light intensity, and p≥1.

[0112] By analogy, for the content sub-area Sv, when the ambient light intensity is L1, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D1, the total number of light source elements that need to be turned on for the target display brightness is Nv1, and the luminous brightness of the Nv1 light source elements after being turned on is the target luminous brightness Bv1; when the ambient light intensity is L2, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D2, the total number of light source elements that need to be turned on for the target display brightness is Nv2, and the luminous brightness of the Nv2 light source elements after being turned on is the target luminous brightness Bv2; ...; when the ambient light intensity is Lp, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_Dp, the total number of light source elements that need to be turned on for the target display brightness is Nvp, and the luminous brightness of the Nvp light source elements after being turned on is the target luminous brightness Bvp.

[0113] In some optional implementations, the preset correspondence may also be a correspondence between ambient light intensity, a target display brightness of a content sub-area, a position of a turned-on second light source element, and a target luminous brightness of the turned-on light source element. The target luminous brightness of the turned-on light source element may include the target luminous brightness of the first light source element and / or the second light source element.

[0114] Table 4 exemplarily shows a preset corresponding relationship.

[0115] Table 4 Preset correspondence diagram

[0116] Ambient light intensity Target display brightness Position of the second light source element turned on Target luminous brightness L1 S1_D1 (x11,y11)(x12,y12) S1_B11, S1_B12 L2 S1_D2 (x11,y11)(x13,y13) S1_B21, S1_B22 L3 S1_D3 (x11,y11)(x12,y12)(x13,y13) S1_B32 …… …… …… …… Lq S1_Dq (x11,y11)…(x1k,y1k) S1_Bq2 …… …… …… …… L1 Sv_D1 (xv1,yv1)(xv3,yv3) Sv_B11, Sv_B12 L2 Sv_D2 (xv2,yv2)(xv3,yv3) Sv_B21, Sv_B22 …… …… …… …… Lq Sv_Dq (xv2,yv2)…(xvk,yvk) Sv_Bq2

[0117] As shown in Table 4, for the content sub-area S1, when the ambient light intensity is L1, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D1, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x12, y12). The target luminous brightness includes S1_B11 and S1_B12. S1_B11 represents the luminous brightness of the first light source element corresponding to the content sub-area S1 after being turned on, and S1_B12 represents the luminous brightness of the second light source element corresponding to the content sub-area S1 and located at (x11, y11) and (x12, y12) after being turned on. When the ambient light intensity is L2, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x13, y13). The target luminous brightness includes S1_B21 and S1_B22. S1_B21 represents the luminous brightness of the first light source element corresponding to the content sub-area S1 after being turned on. S1_B22 represents the luminous brightness of the second light source element corresponding to the content sub-area S1 and at positions (x11, y11) and (x13, y13) after being turned on. When the ambient light intensity is L2, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11) and (x13, y13). When the light intensity is L3, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_D3, and the positions of the second light source elements that need to be turned on for the target display brightness are (x11, y11), (x12, y12), and (x13, y13). The target luminous brightness includes S1_B32, which represents the luminous brightness of the second light source elements corresponding to the content sub-area S1 and at positions (x11, y11), (x12, y12), and (x13, y13) after being turned on (if the first light source element needs to be turned on, its luminous brightness can be determined according to the default luminous brightness configuration information). ); ...; When the ambient light intensity is Lq, the target display brightness that matches the content sub-area S1 with the ambient light intensity is determined to be S1_Dq, and the position of the second light source element that needs to be turned on for the target display brightness is (x11, y11)...(x1k, y1k), and the target luminous brightness includes S1_Bq2, S1_Bq2 represents the luminous brightness of the second light source element corresponding to the content sub-area S1 and located at (x11, y11)...(x1k, y1k) after being turned on (if the first light source element corresponding to the content sub-area S1 needs to be turned on, its luminous brightness can be determined according to the default luminous brightness configuration information).

[0118] By analogy, for the content sub-area Sv, when the ambient light intensity is L1, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D1, and the positions of the second light source elements that need to be turned on for the target display brightness are (xv1, yv1) and (xv3, yv3), and the target luminous brightness includes Sv_B11 and Sv_B12. Sv_B11 represents the luminous brightness of the first light source element corresponding to the content sub-area Sv after being turned on, and Sv_B12 represents the luminous brightness of the second light source element corresponding to the content sub-area Sv and located at (xv1, yv1) and (xv3, yv3) after being turned on. When the ambient light intensity is L2, the target display brightness that matches the content sub-area Sv with the ambient light intensity is determined to be Sv_D2, and the positions of the second light source elements that need to be turned on for the target display brightness are (xv2, yv2) and (xv3, yv3), and the target luminous brightness includes Sv_ B21 and Sv_B22, Sv_B21 represents the luminous brightness of the first light source element corresponding to the content sub-area Sv after being turned on, Sv_B22 represents the luminous brightness of the second light source element corresponding to the content sub-area Sv and located at (xv2, yv2) and (xv3, yv3) after being turned on; ...; when the ambient light intensity is Lq, the target display brightness of the content sub-area Sv that matches the ambient light intensity is determined to be Sv_Dq, and the position of the second light source element that needs to be turned on for the target display brightness is (xv2, yv2)…(xvk, yvk), and the target luminous brightness includes Sv_Bq2, Sv_Bq2 represents the luminous brightness of the second light source element corresponding to the content sub-area Sv and located at (xv2, yv2)…(xvk, yvk) after being turned on (if the first light source element corresponding to the content sub-area Sv needs to be turned on, its luminous brightness can be determined according to the default luminous brightness configuration information).

[0119] It should be noted that the above preset corresponding relationship is only an example, and the embodiments of the present application do not limit this.

[0120] In some optional implementations, before determining the first light source element in the backlight source of the head-up display device corresponding to the content sub-region in the head-up display screen, the method may further include: identifying a target sub-region in the target field of view image, wherein the ambient light intensity corresponding to the target sub-region is greater than a third preset light intensity threshold and / or the ambient light intensity corresponding to the target sub-region is less than a fourth preset light intensity threshold, wherein the fourth preset light intensity threshold is less than the third preset light intensity threshold; and determining a content sub-region in the head-up display screen that overlaps with the target sub-region. The third preset light intensity threshold and the fourth preset light intensity threshold can be determined based on experience, statistical data, simulation data, etc., and are not limited in this embodiment of the present application.

[0121] In some optional implementations, the ambient light intensity of the vehicle also includes the ambient light intensity of the target sub-area; accordingly, after determining the first light source element corresponding to the content sub-area, the method may further include: controlling the switching state of the first light source element and the second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity of the target sub-area corresponding to the content sub-area, so that the content sub-area is at the target display brightness.

[0122] Exemplarily, when the ambient light intensity of the target sub-area is greater than or equal to a first preset light intensity threshold, the switch states of the first light source element and at least one second light source element are determined to be on; when the ambient light intensity of the target sub-area is less than or equal to a second preset light intensity threshold, the switch state of the first light source element is determined to be off, and the switch state of at least one second light source element is determined to be on; according to the determined switch states, the switches of the first light source element and the second light source element are controlled.

[0123] Exemplarily, according to the ambient light intensity of the target sub-area, controlling the switching state of the first light source element and the second light source element whose distance to the first light source element is less than a preset distance threshold, includes: determining the switching state of the first light source element and the second light source element according to the ambient light intensity of the target sub-area and a preset corresponding relationship; according to the determined switching state, controlling the switching of the first light source element and the second light source element so that the content sub-area is at a target display brightness that matches the ambient light intensity; wherein the preset corresponding relationship is a correspondence between the ambient light intensity, the target display brightness of the content sub-area, and the light source element information.

[0124] For example, for a vehicle traveling in clear weather, if there is a white vehicle ahead of it and the white vehicle is within the vehicle's target field of view image, the area corresponding to the white vehicle will have a higher ambient light intensity than other areas of the target field of view image due to the reflection of ambient light by the white vehicle body, and thus belongs to the target sub-area. Furthermore, a content sub-area in the head-up display that overlaps with the target sub-area can be determined. Based on the ambient light intensity of the target sub-area and a preset correspondence, the on / off state of a first light source element corresponding to the content sub-area and the on / off state of a second light source element adjacent to the first light source element are controlled (e.g., the first light source element and at least one second light source element are both on). Thus, when the ambient light intensity of the target sub-area is high, the first light source element and the second light source element jointly compensate for the display brightness of the content sub-area corresponding to the target sub-area, thereby increasing the display brightness of this content sub-area to match the ambient light intensity.

[0125] It is understood that the various method embodiments mentioned in this application can be combined with each other to form combined embodiments without violating the principle logic. Due to space limitations, this application will not go into details. Those skilled in the art will understand that in the above-mentioned methods of specific implementation, the specific execution order of each step should be determined by its function and possible internal logic.

[0126] In a second aspect, an embodiment of the present application provides a backlight control device.

[0127] Figure 8 This is a block diagram of a backlight control device provided in an embodiment of the present application.

[0128] Reference Figure 8 , an embodiment of the present application provides a backlight control device, and the backlight control device 800 may include the following modules.

[0129] An acquisition module 801 is used to obtain the ambient light intensity of the vehicle;

[0130] A determination module 802 is configured to determine a first light source element in a backlight source of a head-up display device that corresponds to a content sub-region in a head-up display screen;

[0131] The control module 803 is configured to control the switching states of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity, so that the content sub-area is at a target display brightness.

[0132] In some optional implementations, when the control module 703 controls the on / off states of the first light source element and the second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity, the following is executed:

[0133] When the ambient light intensity is greater than or equal to a first preset light intensity threshold, determining that the switch states of the first light source element and the at least one second light source element are both on;

[0134] When the ambient light intensity is less than or equal to a second preset light intensity threshold, determining that the switch state of the first light source element is off, and determining that the switch state of at least one second light source element is on;

[0135] Controlling the switching of the first light source element and the second light source element according to the determined switching state;

[0136] The second preset light intensity threshold is smaller than the first preset light intensity threshold.

[0137] In some optional implementations, when the control module 803 controls the on / off states of the first light source element and the second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity, the following is executed:

[0138] Determining the on / off states of the first light source element and the second light source element according to the ambient light intensity and a preset corresponding relationship;

[0139] According to the determined switch state, controlling the switching of the first light source element and the second light source element so that the content sub-area is at a target display brightness that matches the ambient light intensity;

[0140] The preset corresponding relationship is the corresponding relationship between the ambient light intensity, the target display brightness of the content sub-area, and the light source element information.

[0141] In some optional implementations, determining the on / off states of the first light source element and the second light source element according to the ambient light intensity and a preset correspondence includes:

[0142] When the ambient light intensity is greater than or equal to a first preset light intensity threshold, determining that the switch state of the first light source element is on, or when the ambient light intensity is less than or equal to a second preset light intensity threshold, determining that the switch state of the first light source element is off;

[0143] According to the ambient light intensity and the preset corresponding relationship, the first target light source element is determined from the second light source elements, and the switch state of the first target light source element is determined to be on, and the switch state of the second target light source element is determined to be off.

[0144] In some optional implementations, the light source element information includes the total number of turned-on light source elements; accordingly, determining the first target light source element to be turned on from the second light source elements includes:

[0145] Determining a first total number of turned-on light source elements corresponding to a target display brightness according to the ambient light intensity and a preset corresponding relationship;

[0146] determining the first number of first target light source elements according to the difference between the first total number and the number of first light source elements when the ambient light intensity is greater than or equal to a first preset light intensity threshold, or determining the first number of first target light source elements according to the first total number when the ambient light intensity is less than or equal to a second preset light intensity threshold;

[0147] The first target light source elements are selected from the second light source elements according to the first number of the first target light source elements.

[0148] In some optional implementations, the light source element information includes the position of the turned-on second light source element; accordingly, determining the first target light source element to be turned on from the second light source elements includes:

[0149] Determining the position of the turned-on second light source element corresponding to the target display brightness according to the ambient light intensity and a preset corresponding relationship;

[0150] The first target light source element is determined according to the position of the turned-on second light source element.

[0151] In some optional implementations, the light source element information further includes target luminous brightness of the turned-on light source elements; accordingly, after determining the first target light source element to be turned on from the second light source elements, the backlight control device 800 is further configured to perform the following:

[0152] The luminous brightness of the first light source element and the first target light source element in the turned-on state is controlled to be the target luminous brightness.

[0153] In some optional implementations, before the determination module 802 determines the first light source element in the backlight source of the head-up display device corresponding to the content sub-region in the head-up display screen, the backlight control apparatus 800 is further configured to perform the following:

[0154] Identifying a target sub-region in the target field of view image, where the ambient light intensity corresponding to the target sub-region is greater than a third preset light intensity threshold, and / or the ambient light intensity corresponding to the target sub-region is less than a fourth preset light intensity threshold, wherein the fourth preset light intensity threshold is less than the third preset light intensity threshold;

[0155] Determine the content subarea in the heads-up display that overlaps with the target subarea.

[0156] In an embodiment of the present application, when the ambient light intensity of the vehicle is obtained by the acquisition module, in order to enable the head-up display device to provide a virtual image brightness that matches the ambient light intensity, for a content sub-region containing actual display content in the head-up display screen, the determination module first determines the first light source element in the backlight source of the head-up display device corresponding to the content sub-region, and the control module controls the switching state of the first light source element and the second light source element that is closer to the first light source element according to the ambient light intensity. The first light source element and / or the second light source element are turned on to provide light to the content sub-region, thereby making the content sub-region at a target display brightness that is more closely matched to the ambient light intensity. In other words, in an embodiment of the present application, the influence of the neighboring light source elements on the display brightness of the current region is utilized. When the ambient light intensity is determined, in addition to controlling the switching state of the light source element of the current region (i.e., the first light source element), the switching state of the neighboring light source elements (i.e., the second light source element) is also controlled, thereby expanding the adjustable range of the display brightness of the current region, thereby providing a target display brightness that is more closely matched to the ambient light intensity and improving the user experience.

[0157] In a third aspect, an embodiment of the present application provides a head-up display system.

[0158] Figure 9 A block diagram of a head-up display system provided in an embodiment of the present application.

[0159] Reference Figure 9 An embodiment of the present application provides a head-up display system, and the head-up display system 900 may include: a display device 901, a backlight source 902 and a backlight control device 903; wherein the backlight control device 903 is used to execute the backlight control method of any one of the embodiments of the present application.

[0160] In some optional implementations, the display device 901 is a device for displaying a head-up display screen, which can be a liquid crystal display. The backlight source 902 is a device for providing a light source for the display device. The backlight control device 903 can adjust the switching state of the light source element in the backlight source according to the ambient light intensity, so that the content sub-area of ​​the head-up display screen displays the target display brightness that matches the ambient light intensity.

[0161] In some optional implementations, the backlight control device 903 obtains the ambient light intensity of the vehicle, and when the ambient light intensity is greater than or equal to a first preset light intensity threshold, determines that the switch states of the first light source element and at least one second light source element are both on; when the ambient light intensity is less than or equal to a second preset light intensity threshold, determines that the switch state of the first light source element is off, and determines that the switch state of at least one second light source element is on; controls the switching of the first light source element and the second light source element according to the determined switch states; wherein the second preset light intensity threshold is less than the first preset light intensity threshold. The backlight source 902 switches the switch state in response to the switch control of the first light source element and the second light source element by the backlight control device 903. The light emitted by the turned-on first light source element and / or second light source element enters the display device 901, causing the corresponding content sub-area to present a target display brightness that matches the ambient light intensity.

[0162] In an embodiment of the present application, the backlight control device utilizes the influence of the neighboring light source elements on the display brightness of the current area. When determining the ambient light intensity, in addition to controlling the on / off state of the light source elements (i.e., the first light source elements) in the current area, it also controls the on / off state of the neighboring light source elements (i.e., the second light source elements) to increase the adjustable range of the display brightness of the current area; the light source elements of the backlight source switch the on / off state in response to the control of the backlight control device, so that the light emitted by the light source elements in the on state enters the display device, and the corresponding content sub-area can present a target display brightness that is more closely matched with the ambient light intensity, thereby improving the user experience.

[0163] Each module in the above-mentioned apparatus and system may be implemented in whole or in part through software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0164] In addition, the present application also provides electronic devices and computer-readable storage media, which can be used to implement any backlight control method provided in the present application. The corresponding technical solutions and descriptions are referred to the corresponding records in the method section and will not be repeated here.

[0165] Figure 10 A block diagram of an electronic device provided in an embodiment of the present application.

[0166] Reference Figure 10An embodiment of the present application provides an electronic device, which includes: at least one processor 1001; at least one memory 1002, and one or more I / O interfaces 1003, connected between the processor 1001 and the memory 1002; wherein the memory 1002 stores one or more computer programs that can be executed by the at least one processor 1001, and the one or more computer programs are executed by the at least one processor 1001 to enable the at least one processor 1001 to perform the above-mentioned backlight control method.

[0167] Each module in the above-mentioned electronic device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0168] The present application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor / processing core, implements the above-mentioned backlight control method. The computer-readable storage medium may be a volatile or non-volatile computer-readable storage medium.

[0169] An embodiment of the present application also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code runs in a processor of an electronic device, the processor in the electronic device executes the above-mentioned backlight control method.

[0170] It will be understood by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable storage medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium).

[0171] As is well known to those skilled in the art, the term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information (such as computer-readable program instructions, data structures, program modules or other data). Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technology, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those skilled in the art, communication media typically contains computer-readable program instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0172] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0173] The computer program instructions for performing the operation of the present application can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data or source code or object code written in any combination of one or more programming languages, wherein the programming language includes object-oriented programming languages ​​such as Smalltalk, C++, and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions can be executed completely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or executed completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer by any type of network including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (such as by using an Internet service provider to connect to the Internet). In certain embodiments, by utilizing the state information of computer-readable program instructions to personalize electronic circuits, such as programmable logic circuits, field programmable gate arrays (FPGAs) or programmable logic arrays (PLAs), the electronic circuits can execute computer-readable program instructions, thereby realizing various aspects of the present application.

[0174] The computer program product described herein may be implemented in hardware, software, or a combination thereof. In one embodiment, the computer program product is implemented as a computer storage medium. In another embodiment, the computer program product is implemented as a software product, such as a software development kit (SDK).

[0175] Various aspects of the present application are described herein with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer-readable program instructions.

[0176] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device is generated that implements the functions / actions specified in one or more blocks in the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, where these instructions cause the computer, programmable data processing device, and / or other device to operate in a specific manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0177] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0178] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the system, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a part of a module, program segment or instruction, and the part of the module, program segment or instruction includes one or more executable instructions for realizing the logical function of the specification. In some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a special hardware-based system that performs the function or action of the specification, or can be implemented by a combination of special hardware and computer instructions.

[0179] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for purposes of limitation. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly indicated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present application as set forth in the appended claims.

Claims

1. A backlight control method, characterized in that: The method comprises: Get the vehicle's ambient light intensity; Determining a first light source element in a backlight source of a head-up display device corresponding to a content sub-region in a head-up display screen; According to the ambient light intensity, the on / off states of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold are controlled to make the content sub-area at a target display brightness.

2. The method according to claim 1, characterized in that The controlling, according to the ambient light intensity, the on / off states of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold, comprises: When the ambient light intensity is greater than or equal to a first preset light intensity threshold, determining that the switch states of the first light source element and at least one of the second light source elements are both on; When the ambient light intensity is less than or equal to a second preset light intensity threshold, determining that the switch state of the first light source element is off, and determining that the switch state of at least one of the second light source elements is on; Controlling the switching of the first light source element and the second light source element according to the determined switching state; The second preset light intensity threshold is smaller than the first preset light intensity threshold.

3. The method according to claim 1, characterized in that The controlling, according to the ambient light intensity, the on / off states of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold, includes: determining the on / off states of the first light source element and the second light source element according to the ambient light intensity and a preset corresponding relationship; According to the determined switch state, controlling the switching of the first light source element and the second light source element so that the content sub-area is at the target display brightness matching the ambient light intensity; The preset corresponding relationship is a corresponding relationship between the ambient light intensity, the target display brightness of the content sub-area, and the light source element information.

4. The method according to claim 3, characterized in that The determining the on / off states of the first light source element and the second light source element according to the ambient light intensity and a preset corresponding relationship includes: When the ambient light intensity is greater than or equal to a first preset light intensity threshold, determining that the switch state of the first light source element is on, or when the ambient light intensity is less than or equal to a second preset light intensity threshold, determining that the switch state of the first light source element is off; According to the ambient light intensity and the preset corresponding relationship, a first target light source element is determined from the second light source elements, and the switch state of the first target light source element is determined to be on.

5. The method according to claim 4, characterized in that The light source element information includes the total number of turned-on light source elements; The determining of the first target light source element from the second light source elements includes: determining, according to the ambient light intensity and the preset corresponding relationship, a first total number of the turned-on light source elements corresponding to the target display brightness; determining the first number of the first target light source elements according to the difference between the first total number and the number of the first light source elements when the ambient light intensity is greater than or equal to the first preset light intensity threshold, or determining the first number of the first target light source elements according to the first total number when the ambient light intensity is less than or equal to the second preset light intensity threshold; The first target light source elements are selected from the second light source elements according to the first number of the first target light source elements.

6. The method according to claim 5, characterized in that The light source element information includes the position of the turned-on second light source element; The determining of the first target light source element from the second light source elements includes: determining, according to the ambient light intensity and the preset corresponding relationship, a position of the turned-on second light source element corresponding to the target display brightness; The first target light source element is determined according to the position of the turned-on second light source element.

7. The method according to claim 5 or 6, characterized in that The light source element information also includes the target luminous brightness of the turned-on light source element; After determining the first target light source element to be turned on from the second light source elements, the method further includes: The luminous brightness of the first light source element and the first target light source element in the turned-on state is controlled to be the target luminous brightness.

8. The method according to claim 1, characterized in that Before determining the first light source element in the backlight source of the head-up display device corresponding to the content sub-region in the head-up display screen, the method further includes: Identifying a target sub-region in the target field of view image, wherein the ambient light intensity corresponding to the target sub-region is greater than a third preset light intensity threshold, and / or the ambient light intensity corresponding to the target sub-region is less than a fourth preset light intensity threshold, wherein the fourth preset light intensity threshold is less than the third preset light intensity threshold; The content sub-region overlapping with the target sub-region in the head-up display screen is determined.

9. A backlight control device, characterized in that: The device comprises: The acquisition module is used to obtain the ambient light intensity of the vehicle; a determining module, configured to determine a first light source element in a backlight source of a head-up display device corresponding to a content sub-region in a head-up display screen; The control module is configured to control the switching state of the first light source element and a second light source element whose distance from the first light source element is less than a preset distance threshold according to the ambient light intensity, so that the content sub-area is at a target display brightness.

10. A head-up display system, characterized in that: The system includes: a display device, a backlight source and a backlight control device; wherein, The backlight control device is used to execute the backlight control method according to any one of claims 1 to 8.

11. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores one or more computer programs that can be executed by the at least one processor. The one or more computer programs are executed by the at least one processor to enable the at least one processor to perform the backlight control method according to any one of claims 1 to 8.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the computer program implements the backlight control method according to any one of claims 1 to 8.

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