Backlight module, image generation unit and head-up display system
By combining the light source module and the optical path adjustment array, directional light emission is achieved, which solves the cost and thermal management problems caused by high-resolution screens and high-brightness backlights, improves the 3D display effect and reduces light crosstalk, and adapts to the display needs of different scenarios.
Patent Information
- Application Number
- CN202511070620.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-11-11
AI Technical Summary
In existing technologies, achieving 3D display by selecting high-resolution screens and increasing backlight brightness leads to increased costs, thermal management issues, and light crosstalk, which affects the display effect.
It employs multiple light source modules and an optical path adjustment array. The initial light is deflected by the optical path adjustment element to control the illumination area of the light-emitting element. It emits light in a directional manner according to the user's eye position, thereby reducing energy consumption and light crosstalk.
It achieves reduced backlight module power consumption, improved heat dissipation, prevents screen burn-in, enhances 2D or 3D imaging effects, reduces light crosstalk, and strengthens the adaptability and flexibility of the display system.
Smart Images
Figure CN120928608A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of display technology, and particularly relates to a backlight module, a picture generation unit (PGU), and a head-up display (HUD). Background Technology
[0002] With the continuous development of HUD technology, gratings can be added to the structure of the HUD system to split the light beams, so that the two sets of light beams obtained by the split beams are imaged in the left and right eyes of the human eye respectively, thereby realizing 3D imaging.
[0003] In related technologies, the reduction in resolution and loss of brightness caused by grating beam splitting can be compensated for by selecting a screen with high resolution and increasing the brightness of the backlight module. See also Figure 1A and Figure 1B Taking an in-vehicle HUD as an example, the HUD may include: a PGU (Portable Spectrum Unit), a lenticular lens grating attached to the liquid crystal display (LCD) within the PGU, and a reflector assembly (such as...). Figure 1A (Refractive mirrors 1 and 2 shown). Figure 1B As shown, the PGU may include an LCD and a backlight module. The LCD may include an analyzer, a glass substrate, a color filter (CF), liquid crystal, and a polarizer. The backlight module may include a lamp panel, an LED lamp total internal reflection lens, and a microlens array.
[0004] However, in practical applications, choosing a high-resolution screen and increasing backlight brightness can lead to cost and thermal management issues. Furthermore, splitting the light beam into two sets of light can cause crosstalk, resulting in suboptimal 3D display effects. Summary of the Invention
[0005] This application provides a backlight module, an image generation unit, and a head-up display system to solve the problems of cost and thermal management issues caused by selecting a high-resolution screen and increasing the brightness of the backlight, as well as the potential crosstalk between the two sets of light obtained by beam splitting, resulting in poor 3D display effects.
[0006] To achieve the above objectives, this application adopts the following technical solution:
[0007] In a first aspect, embodiments of this application provide a backlight module, the backlight module comprising: a plurality of light source modules and an optical path adjustment array, each of the light source modules comprising a plurality of light-emitting elements;
[0008] For each of the light-emitting elements, the initial light emitted by the light-emitting element is adjusted by the optical path adjustment array to obtain deflected light, and the irradiated area illuminated by the deflected light corresponds to the light-emitting element;
[0009] Each of the light-emitting elements corresponds to a different illumination area, and each illumination area covers the observation area where the eye point is located. The eye point is the position where the user observes the deflected light through their eyes.
[0010] The backlight module is used to control the light-emitting element corresponding to the illumination area that matches the observation area to emit light according to the observation area where the eye point is located, so as to illuminate the observation area and cause the light to be deflected to illuminate the observation area.
[0011] Optionally, the optical path adjustment array includes multiple optical path adjustment elements;
[0012] Each of the light-emitting elements corresponds to at least one optical path adjustment element;
[0013] For each of the light-emitting elements, the initial light emitted by the light-emitting element is deflected by the corresponding optical path adjustment element to obtain the deflected light.
[0014] Optionally, the arrangement direction of the plurality of observation areas is consistent with the arrangement direction of the plurality of light source modules and the arrangement direction of each light-emitting element in each light source module.
[0015] Optionally, if multiple observation areas are arranged simultaneously along the first direction and the second direction, then multiple light source modules are also arranged simultaneously along the first direction and the second direction.
[0016] The plurality of light-emitting elements in each light source module are arranged along the first direction or the second direction.
[0017] Optionally, the number of the plurality of light-emitting elements in each of the light source modules is consistent with the number of the plurality of observation areas.
[0018] Optionally, each of the light-emitting elements in each of the light source modules periodically emits the initial light in sequence.
[0019] Optionally, when each of the light source modules emits the initial light through the light-emitting element simultaneously, multiple initial light rays illuminate the same illumination area.
[0020] Optionally, each of the light source modules is arranged on the same side of the optical path adjustment array.
[0021] Optionally, each of the light source modules is located on the same plane;
[0022] The plane in which any of the light source modules is located is parallel to the plane in which the optical path adjustment array is located.
[0023] Optionally, the optical path adjustment array includes multiple optical path adjustment elements;
[0024] The optical path adjustment element is a cylindrical lens, a Fresnel lens, or a holographic optical element.
[0025] Optionally, the light-emitting element is a light-emitting diode or a miniature light-emitting diode.
[0026] Secondly, embodiments of this application provide an image generation unit, the image generation unit comprising: a liquid crystal display screen and a backlight module as described in any of the first aspects;
[0027] The backlight module is used to generate emitted light;
[0028] The liquid crystal display screen is located on the propagation path of the emitted light and is used to display images based on the emitted light.
[0029] Optionally, when the optical path adjustment element of the optical path adjustment array in the backlight module is a holographic optical element, the optical path adjustment element is attached to the liquid crystal display screen.
[0030] Thirdly, embodiments of this application provide a head-up display system, the head-up display system comprising: a driver monitoring system, a plurality of reflectors, and an image generation unit as described in the second aspect;
[0031] The driver monitoring system is used to determine the eye position of the vehicle driver, and according to the eye position, control the LED beads in the image generation unit corresponding to the area where the eye position is located to emit light to generate outgoing light.
[0032] The emitted light rays are reflected by multiple mirrors, so that the reflected light rays illuminate the area where the eye point is located.
[0033] Optionally, the driver monitoring system includes an eye-tracking device for determining the eye position of the vehicle driver.
[0034] This application provides a backlight module comprising: at least one light source module and an optical path adjustment module. Each light source module includes at least one light-emitting element. The light source module emits initial light through the at least one light-emitting element. The optical path adjustment module is located on the propagation path of the initial light and adjusts the propagation angle of the initial light to obtain deflected light. The illumination area illuminated by the deflected light corresponds to the light-emitting element that emitted the initial light, and the illumination areas corresponding to each light-emitting element are different. Moreover, the backlight module can control the light-emitting element corresponding to the illumination area matching the observation area to illuminate the observation area according to the observation area where the eye point is located, so that the deflected light illuminates the observation area. The eye point is the position where the user observes the deflected light through their eyes. The solution provided in this application embodiment allows the initial light emitted by each light-emitting element to have its propagation angle adjusted by an optical path adjustment module. This enables the initial light emitted by each light-emitting element to illuminate different areas, forming an illumination area corresponding to each light-emitting element. Each illumination area can correspond to a different eye point of the user. Thus, different light-emitting elements can be selected to emit light at different times according to the different eye points of the vehicle driver. This can reduce the energy consumption of the backlight module, improve the heat dissipation of the backlight module, and also reduce the screen temperature of the liquid crystal display adjacent to the backlight module, preventing screen burn-in.
[0035] Furthermore, by sending light only to the area where the user's eye point is located and turning off other light-emitting elements, crosstalk between the light emitted by each light-emitting element can be reduced, thereby improving the 2D or 3D effect of the image in the user's eye. Attached Figure Description
[0036] Figure 1A This is a schematic diagram of the structure of a HUD in the prior art;
[0037] Figure 1B This is a schematic diagram of the structure of a PGU in the prior art;
[0038] Figure 2 This is a schematic diagram of the structure of a head-up display system containing an image generation unit of a backlight module according to an embodiment of this application.
[0039] Figure 3 This is a schematic diagram of the structure of a backlight module provided in an embodiment of this application;
[0040] Figure 4A , Figure 4B and Figure 4C These are all schematic diagrams illustrating directional light emission based on an eyepoint, provided in the embodiments of this application.
[0041] Figure 5 This is a schematic diagram of another backlight module provided in an embodiment of this application;
[0042] Figure 6 This is a schematic diagram of another backlight module provided in an embodiment of this application. Detailed Implementation
[0043] In the following description, specific details such as particular system architectures and technologies are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known HUD display technologies, the structure of HUD display systems, and HUD display devices are omitted so as not to obscure the description of this application with unnecessary details.
[0044] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “the,” “the,” and “the” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.
[0045] See Figure 2 , Figure 2 This is a schematic diagram of the structure of a head-up display system containing an image generation unit of a backlight module according to an embodiment of this application. The head-up display system may include: a processor 210, a driver monitoring system 220, multiple reflectors 230 and an image generation unit 240.
[0046] The image generation unit 240 may include a liquid crystal display screen 241 and a backlight module 242.
[0047] Correspondingly, the backlight module 242 is used to generate initial light, and the liquid crystal display screen 241 can be located on the propagation path of the initial light to display an image based on the initial light, so that the light of the displayed image can be reflected by multiple reflectors 230 and illuminate the observation area where the driver's eye point is located, thereby realizing directional illumination of the image generation unit 240 based on the driver's eye point.
[0048] Furthermore, the image generation unit may also include a beam splitter.
[0049] The beam splitter can be located on the side of the liquid crystal display 241 away from the backlight module 242. The beam splitter can split the initial light displayed on the liquid crystal display 241 into multiple beams, thereby achieving a three-dimensional display effect after multiple beams enter the human eye.
[0050] It should be noted that if the multiple light-transmitting elements included in the optical path adjustment module of the backlight module 242 are holographic optical elements, then the multiple light-transmitting elements can be bonded to the liquid crystal display screen. Of course, other optical components can also be used for each light-transmitting element in the backlight module 242, and different arrangements can be adopted. This application embodiment does not specifically limit the type and arrangement of each light-transmitting element.
[0051] Specifically, the driver monitoring system 220 can use a built-in eye-tracking device to confirm the observation area where the user's (such as a vehicle driver's) eye point is located. That is, it can confirm the position of the light rays in the image displayed by the image generation unit 240 through the user's eyes, thereby obtaining the spatial position information corresponding to the observation area where the eye point is located.
[0052] Subsequently, the driver monitoring system 220 can send the observation area where the user's eye point is located to the processor 210. The processor 210 can determine the illumination area that matches the observation area based on the observation area where the eye point is located, and then determine the corresponding light-emitting element of the backlight module 242 based on the illumination area.
[0053] Furthermore, the processor 210 can generate light-emitting instructions based on the determined light-emitting element. Additionally, during the generation of the light-emitting instructions, the processor can determine the current parameters of the light-emitting element corresponding to the observation area (where the eye point is located) when it emits light, and thus incorporate the current parameters into the light-emitting instructions. The current parameters represent the brightness of the light-emitting element when it emits light.
[0054] Correspondingly, after receiving the light emission command, the image generation unit 240 can emit light according to the light emission element indicated by the light emission command, and control the light emission brightness of the light emission element according to the current parameters carried by the light emission command. In this way, it can control the light emission element corresponding to the observation area to emit initial light according to the set current parameters, and then illuminate the observation area where the user's eye point is located through the initial light, so as to realize the directional illumination of the head-up display system.
[0055] It should be noted that the embodiments of this application use the data interaction between the processor 210, the driver monitoring system 220 and the image generation unit 240 as an example for illustration. In actual applications, the processor 210 may be built into the driver monitoring system 220 or installed in the vehicle. The embodiments of this application do not specifically limit the processor 210.
[0056] For example, the processor 210 can be a data processing device for the vehicle's infotainment system. The infotainment system can receive the observation area corresponding to the eye point sent by the driver monitoring system 220, and then analyze the observation area in conjunction with the illumination area corresponding to each LED in the image generation unit 240 to determine the LED that matches the observation area information. Then, it sends a light emission command to the image generation unit 240 to instruct the light emission element (such as an LED) that matches the spatial position information to emit light.
[0057] The structure of the backlight module in the image generation unit will be described in detail below.
[0058] Figure 3 This is a schematic diagram of a backlight module provided in an embodiment of this application. It is illustrative and not limiting. See also Figure 3 The backlight module includes at least one light source module 310 and an optical path adjustment module 320.
[0059] Each light source module 310 may include at least one light-emitting element 311.
[0060] Specifically, the light source module 310 can emit initial light through at least one light-emitting element 311, and the optical path adjustment module 320 can be located on the propagation path of the initial light to adjust the propagation angle of the initial light and obtain deflected light.
[0061] The irradiated area illuminated by the deflected light corresponds to the light-emitting element 311 that emits the initial light, and the irradiated areas corresponding to each light-emitting element 311 are different.
[0062] Correspondingly, the backlight module can control the light-emitting element 311 corresponding to the illumination area that matches the observation area to illuminate the observation area, so that the deflected light can illuminate the observation area, thereby realizing the function of directional light emission according to the eye point.
[0063] The eyepoint is the position where the user observes the deflected light through their eyes.
[0064] For example, see Figure 4A , Figure 4B and Figure 4C , Figure 4A , Figure 4B and Figure 4C These are all schematic diagrams illustrating directional light emission based on an eyepoint, provided in the embodiments of this application. Figure 4A As shown, when the eye point is located in the observation area to the left, it can be illuminated by the light-emitting element 311 (the white-background, black-bordered LED in the figure), while the other light-emitting elements 311 (the black-background, black-bordered LED in the figure) do not emit light.
[0065] Similarly, such as Figure 4B As shown, when the eye point is located in the observation area biased to the right, light can be emitted by the light-emitting element 311 near the left side, while the other light-emitting elements 311 do not emit light. Further, as... Figure 4C As shown, when the eye point is located in the central observation area, it can be illuminated by the light-emitting element 311 near the center, while the other light-emitting elements 311 do not emit light.
[0066] It should be noted that in practical applications, the light source module 310 and the optical path adjustment module 320 may include different optical components, and different arrangement methods may be used for different optical components to achieve directional illumination of the light-emitting element 311.
[0067] In one alternative embodiment, Figure 5 This is a schematic diagram of another backlight module provided in an embodiment of this application. It is provided as an example and not as a limitation. See also Figure 5 At least one light source module 310 may include: multiple light source modules 310, each light source module 310 including: multiple light-emitting elements 311.
[0068] Furthermore, the optical path adjustment module 320 may include a light-transmitting element array 321, which includes multiple light-transmitting elements.
[0069] Each light-transmitting element can correspond to multiple light-emitting elements 311. Accordingly, for each light-transmitting element, the light-transmitting element can be located in the optical path of the initial light emitted by the corresponding multiple light-emitting elements 311, in order to adjust the propagation angle of the initial light and obtain deflected light.
[0070] Specifically, the image generation unit can control the backlight module to determine at least one light-emitting element 311 that needs to emit light based on the received light emission command. Then, the backlight module can control the circuit containing the at least one light-emitting element 311 to be turned on, so that the at least one light-emitting element 311 emits light.
[0071] Accordingly, for each specific light-emitting element 311 that needs to emit light, the initial light emitted by the light-emitting element 311 can pass through the light-transmitting element corresponding to the light-emitting element 311. The propagation angle of the initial light is adjusted by the light-transmitting element to form deflected light, so that the deflected light can accurately illuminate the illumination area corresponding to the light-emitting element 311.
[0072] It should be noted that the above description uses the light-emitting element 311 of a light source module 310 as an example. In actual applications, multiple light-emitting elements 311 of light source modules 310 can emit light to illuminate the same irradiation area. This application embodiment does not specifically limit the number of light-emitting light source modules 310 or the number of light-emitting elements 311.
[0073] The above example illustrates the principle of directional light emission from a backlight module, using the example of the backlight module emitting light according to a received light emission command. In practical applications, the backlight module can also periodically emit light through multiple light-emitting elements 311 according to pre-set commands, thereby periodically illuminating multiple illumination areas and achieving coverage of various observation areas where the eye point is located.
[0074] Optionally, each light-emitting element 311 in each light source module 310 can periodically emit initial light sequentially, and each light-emitting element 311 corresponds to a different illumination area, so that each illumination area can be illuminated by periodically emitting light through each light-emitting element 311.
[0075] Furthermore, the backlight module may include multiple light source modules 310. When the backlight module emits light, the multiple light source modules 310 may also emit light simultaneously, thereby illuminating the same irradiation area or multiple irradiation areas through the multiple light source modules 310.
[0076] For example, when each light source module 310 emits initial light through the light-emitting element 311 at the same time, multiple initial light rays can illuminate the same irradiation area. That is, within the current light emission cycle, the light-emitting elements 311 in each light source module 310 correspond to the same irradiation area, so that multiple light-emitting elements 311 can emit light, thereby increasing the light intensity of the irradiation area.
[0077] Furthermore, when illuminating the same area with multiple light source modules 310, the number of multiple light-emitting elements 311 in each light source module 310 can be consistent with the number of multiple observation areas.
[0078] That is, for each light source module 310, the multiple light-emitting elements 311 in the light source module 310 can illuminate different irradiation areas respectively, so that each irradiation area can be illuminated by one light source module 310.
[0079] Furthermore, the backlight module may include multiple light source modules 310. When multiple light source modules 310 emit light periodically at the same time, the multiple light-emitting elements 311 that emit light at the same time can be divided into a group of light-emitting elements 311, and each group of light-emitting elements 311 corresponds to the same illumination area.
[0080] For example, see Figure 6 , Figure 6 This is a schematic diagram of another backlight module provided in the embodiments of this application. The backlight module includes multiple light source modules 310, each light source module 310 includes 3 light-emitting elements 311, and the multiple light-emitting elements 311 included in the multiple light source modules 310 can be divided into three groups: A, B and C.
[0081] In Group A, each light-emitting element 311 is the first LED from left to right covered by five cylindrical lenses; in Group B, each light-emitting element 311 is the second LED from left to right covered by five cylindrical lenses; and in Group C, each light-emitting element 311 is the third LED from left to right covered by five cylindrical lenses.
[0082] Correspondingly, if the illumination area corresponding to group A is the observation area corresponding to the user's left eye, then the illumination area corresponding to group C is the observation area corresponding to the user's right eye. Moreover, since the cylindrical lens has a focusing effect, the initial light emitted by group A is only the light displayed by the illumination area corresponding to group A (the user's left eye), and the initial light emitted by the other light-emitting elements 311 groups cannot be seen.
[0083] It should be noted that the arrangement direction of the multiple observation areas can be consistent with the arrangement direction of the multiple light source modules 310. For example, if the multiple observation areas are arranged horizontally, the multiple light source modules 310 can also be arranged horizontally so that each light source module 310 illuminates each observation area.
[0084] Furthermore, if multiple observation areas are arranged along the first direction and the second direction respectively, then multiple light source modules 310 are also arranged along the first direction and the second direction respectively. For example, if multiple observation areas are arranged along the horizontal and vertical directions respectively, forming an array, then multiple light source modules 310 can also be arranged along the horizontal and vertical directions respectively, forming an array composed of multiple light source modules 310.
[0085] It should be noted that if each of the multiple light source modules 310 arranged along the first direction and the second direction can include multiple light-emitting elements 311, then the multiple light-emitting elements 311 in each light source module 310 can be arranged along the first direction or the second direction. The embodiments of this application do not specifically limit the arrangement of each light-emitting element 311.
[0086] It should also be noted that the aforementioned optical path adjustment module 320 may include a light-transmitting element or a reflective element. If the optical path adjustment module 320 includes a light-transmitting element, the light-transmitting element may be a lens or a holographic optical element (such as...). Figure 6 The light-transmitting element array 321 shown is an example. For instance, the lens can be a cylindrical lens (such as...). Figure 3 Central optical path adjustment module 320) or Fresnel lens (such as Figure 5 The light-transmitting element array 321 shown in this application does not specifically limit the specific type of lens in this embodiment.
[0087] Similarly, the light-emitting element 311 included in the light source module 310 can be a light-emitting diode (LED) or a micro light-emitting diode (Micro LED), and the type of light-emitting element 311 in this embodiment is not specifically limited.
[0088] In summary, the backlight module proposed in this application includes at least one light source module and an optical path adjustment module. Each light source module includes at least one light-emitting element. The light source module emits initial light through the at least one light-emitting element. The optical path adjustment module is located on the propagation path of the initial light and adjusts the propagation angle of the initial light to obtain deflected light. The illumination area illuminated by the deflected light corresponds to the light-emitting element that emitted the initial light, and the illumination areas corresponding to each light-emitting element are different. Moreover, the backlight module can control the light-emitting element corresponding to the illumination area matching the observation area to illuminate the observation area according to the observation area where the eye point is located, so that the deflected light illuminates the observation area. The eye point is the position where the user observes the deflected light through their eyes. The solution provided in this application embodiment allows the initial light emitted by each light-emitting element to have its propagation angle adjusted by an optical path adjustment module. This enables the initial light emitted by each light-emitting element to illuminate different areas, forming an illumination area corresponding to each light-emitting element. Each illumination area can correspond to a different eye point of the user. Thus, different light-emitting elements can be selected to emit light at different times according to the different eye points of the vehicle driver. This can reduce the energy consumption of the backlight module, improve the heat dissipation of the backlight module, and also reduce the screen temperature of the liquid crystal display adjacent to the backlight module, preventing screen burn-in.
[0089] Furthermore, by sending light only to the area where the user's eye point is located and turning off other light-emitting elements, crosstalk between the light emitted by each light-emitting element can be reduced, thereby improving the 2D or 3D effect of the image in the user's eye.
[0090] In addition, the directional backlight design can better prevent stray light from other angles and prevent glare.
[0091] Furthermore, the head-up display system uses a processor to calculate the current parameters required for each light-emitting element to emit light. By adjusting the magnitude of the current parameters, the brightness of the light-emitting elements can be improved, thereby enhancing the adaptability and flexibility of the head-up display system when the vehicle is in different scenarios.
[0092] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0093] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0094] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0095] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.
[0096] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.
[0097] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0098] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."
[0099] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0100] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A backlight module, characterized in that, The backlight module includes: multiple light source modules and an optical path adjustment array, each of the light source modules including multiple light-emitting elements; For each of the light-emitting elements, the initial light emitted by the light-emitting element is adjusted by the optical path adjustment array to obtain deflected light, and the irradiated area illuminated by the deflected light corresponds to the light-emitting element; Each of the light-emitting elements corresponds to a different illumination area, and each illumination area covers the observation area where the eye point is located. The eye point is the position where the user observes the deflected light through their eyes. The backlight module is used to control the light-emitting element corresponding to the illumination area that matches the observation area to emit light according to the observation area where the eye point is located, so as to illuminate the observation area and cause the light to be deflected to illuminate the observation area.
2. The backlight module according to claim 1, characterized in that, The optical path adjustment array includes multiple optical path adjustment elements; Each of the light-emitting elements corresponds to at least one optical path adjustment element; For each of the light-emitting elements, the initial light emitted by the light-emitting element is deflected by the corresponding optical path adjustment element to obtain the deflected light.
3. The backlight module according to claim 1, characterized in that, The arrangement direction of the multiple observation areas is consistent with the arrangement direction of the multiple light source modules and the arrangement direction of each light-emitting element in each light source module.
4. The backlight module according to claim 3, characterized in that, If multiple observation areas are arranged simultaneously along the first direction and the second direction, then multiple light source modules are also arranged simultaneously along the first direction and the second direction. The plurality of light-emitting elements in each light source module are arranged along the first direction or the second direction.
5. The backlight module according to claim 1, characterized in that, The number of the plurality of light-emitting elements in each of the light source modules is consistent with the number of the plurality of observation areas.
6. The backlight module according to claim 5, characterized in that, Each of the light-emitting elements in each of the light source modules periodically emits the initial light in sequence.
7. The backlight module according to claim 6, characterized in that, When each of the light source modules emits the initial light through the light-emitting element, multiple initial light rays illuminate the same illumination area.
8. The backlight module according to any one of claims 1 to 7, characterized in that, Each of the aforementioned light source modules is arranged on the same side of the optical path adjustment array.
9. The backlight module according to any one of claims 1 to 7, characterized in that, Each of the aforementioned light source modules is located on the same plane; The plane in which any of the light source modules is located is parallel to the plane in which the optical path adjustment array is located.
10. The backlight module according to any one of claims 1 to 7, characterized in that, The optical path adjustment array includes multiple optical path adjustment elements; The optical path adjustment element is a cylindrical lens, a Fresnel lens, or a holographic optical element.
11. The backlight module according to any one of claims 1 to 7, characterized in that, The light-emitting element is a light-emitting diode or a miniature light-emitting diode.
12. An image generation unit, characterized in that, The image generation unit includes: a liquid crystal display screen and a backlight module as described in any one of claims 1 to 11; The backlight module is used to generate emitted light; The liquid crystal display screen is located on the propagation path of the emitted light and is used to display images based on the emitted light.
13. The image generation unit according to claim 12, characterized in that, When the optical path adjustment element of the optical path adjustment array in the backlight module is a holographic optical element, the optical path adjustment element is attached to the liquid crystal display screen.
14. A head-up display system, characterized in that, The head-up display system includes: a driver monitoring system, multiple reflectors, and an image generation unit as described in claim 13; The driver monitoring system is used to determine the eye position of the vehicle driver, and according to the eye position, control the LED beads in the image generation unit corresponding to the area where the eye position is located to emit light to generate outgoing light. The emitted light rays are reflected by multiple mirrors, so that the reflected light rays illuminate the area where the eye point is located.
15. The head-up display system according to claim 14, characterized in that, The driver monitoring system includes an eye-tracking device used to determine the eye position of the vehicle driver.