Backlight module, image generation unit and head-up display system

Abstract

The invention provides a backlight module, an image generation unit and a head-up display system, and relates to the technical field of display, the backlight module comprises a plurality of light source modules and a reflective array; each light source module is used for emitting initial light; the reflective array is located on a propagation path of each initial light ray and reflects each initial light ray to obtain a deflected light ray, and an irradiation area irradiated by the deflected light ray corresponds to each light source module; the irradiation areas corresponding to the light source modules are different. According to the technical scheme, different light-emitting elements can be selected to emit light at different moments according to different eye spots of a user, the energy consumption of the backlight module can be reduced, the heat dissipation performance of the backlight module can be improved, the screen temperature of a liquid crystal display screen adjacent to the backlight module can be reduced, screen burn-in is prevented, and the user experience is improved. In addition, crosstalk among the light rays emitted by the light-emitting elements can be reduced by only sending the light rays to the area where the eye points of the user are located.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a backlight module, a picture generation unit (PGU) and a head-up display (HUD). BACKGROUND

[0002] With the continuous development of the HUD technology, a grating can be added in the structure of the HUD system, and the light is split by the grating, so that the two groups of light obtained by splitting are imaged in the left eye and the right eye of the human eye respectively, thereby realizing 3D imaging.

[0003] In the related art, a screen with high resolution can be selected, and the brightness of the backlight module is increased to compensate for the decrease in resolution and the loss of brightness caused by the grating splitting. See Figure 1A and Figure 1B Taking a vehicle-mounted HUD as an example, the HUD can include a PGU, a cylindrical grating attached to a liquid crystal display (LCD) in the PGU, and a mirror assembly (such as the mirror 1 and the mirror 2 shown in Figure 1A ). As shown in Figure 1B , the PGU can include an LCD and a backlight module, the LCD can include an analyzer, a glass substrate, a color filter (CF), a liquid crystal, and a polarizer, and the backlight module can include a lamp panel, an LED lamp total internal reflection lens, and a microlens array.

[0004] However, in actual applications, selecting a high-resolution screen and increasing the brightness of the backlight can cause problems of cost and heat management. Moreover, splitting the light to obtain two groups of light can cause crosstalk, resulting in poor 3D display effect. SUMMARY

[0005] The present application provides a backlight module, a picture generation unit and a head-up display, which solves the problems of cost and heat management caused by selecting a high-resolution screen and increasing the brightness of the backlight in the related art, and crosstalk caused by splitting the light to obtain two groups of light, resulting in poor 3D display effect.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a backlight module, characterized in that the backlight module comprises a plurality of light source modules and a light reflection array.

[0008] Each of the light source modules is configured to emit an initial light;

[0009] The reflection array is located on the propagation path of each initial light ray, and reflects each initial light ray to obtain a deflected light ray, and an irradiation area irradiated by the deflected light ray corresponds to each light source module;

[0010] The irradiation areas corresponding to each light source module are all different, and each irradiation area covers an observation area where an eye point is located, and the eye point is a position where a user observes the deflected light ray through eyes;

[0011] The backlight module is used for controlling the light source modules corresponding to the irradiation areas matched with the observation area where the eye point is located to emit light, and irradiating the observation area, so that the deflected light ray irradiates the observation area.

[0012] Optionally, the reflection array comprises a plurality of reflection elements, each reflection element corresponding to each light source module in one-to-one manner.

[0013] For each light source module, the initial light ray emitted by the light source module is reflected by the corresponding reflection element to obtain the deflected light ray.

[0014] Optionally, the plurality of reflection elements are distributed around the plurality of light source modules in a rotationally symmetrical manner.

[0015] Optionally, the arrangement directions of the plurality of observation areas are consistent with the arrangement directions of the plurality of light source modules.

[0016] Optionally, if the plurality of observation areas are arranged along a first direction and a second direction respectively, the plurality of light source modules are also arranged along the first direction and the second direction respectively.

[0017] Optionally, the reflection array comprises a plurality of reflection elements.

[0018] The number of the plurality of reflection elements is consistent with the number of the plurality of observation areas.

[0019] Optionally, each light source module periodically emits the initial light ray in turn.

[0020] Optionally, each light source module comprises at least one light emitting element.

[0021] The at least one light emitting element in each light source module periodically emits the initial light ray in turn.

[0022] Optionally, for each light source module, each light emitting element of the light source module emits the initial light ray, and each initial light ray irradiates a same irradiation area.

[0023] Optionally, the light reflection array comprises a plurality of light reflection elements.

[0024] The light reflection element is a curved mirror or a light reflection cup.

[0025] Optionally, the curved mirror is a concave mirror or a convex mirror.

[0026] Optionally, the light emitting element is a light emitting diode or a micro light emitting diode.

[0027] In a second aspect, an embodiment of the present application provides an image generation unit, comprising: a liquid crystal display screen and the backlight module according to any one of the first aspect.

[0028] The backlight module is configured to generate outgoing light rays.

[0029] The liquid crystal display screen is located on a propagation path of the outgoing light rays and is configured to display images according to the outgoing light rays.

[0030] In a third aspect, an embodiment of the present application provides a head-up display system, comprising: a driver monitoring system, a plurality of mirrors and the image generation unit according to the second aspect.

[0031] The driver monitoring system is configured to determine an eye point position of a driver of a vehicle and control light emitting diodes in the image generation unit corresponding to a region where the eye point position is located to generate outgoing light rays according to the eye point position.

[0032] The outgoing light rays are reflected by the plurality of mirrors to irradiate the region where the eye point position is located.

[0033] Optionally, the driver monitoring system comprises an eye tracking device configured to determine the eye point position of the driver of the vehicle.

[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. DETAILED DESCRIPTION

[0042] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, processes, devices, and known structures are omitted so as not to obscure the description of the present application.

[0043] The terminology used in the following description merely for the purpose of describing particular embodiments of the present application and is not intended to limit the present application. As used in this description and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0044] Referring to Figure 2 , Figure 2 A structure diagram of a head-up display system in which an image generation unit of a backlight module according to an embodiment of the present application is located. The head-up display system can include a processor 210, a driver monitoring system 220, a plurality of mirrors 230, and an image generation unit 240.

[0045] The image generation unit 240 can include a liquid crystal display screen 241 and a backlight module 242.

[0046] Correspondingly, the backlight module 242 is configured to generate initial light, and the liquid crystal display screen 241 can be located on a propagation path of the initial light and configured to display an image according to the initial light, so that light of the displayed image can be reflected by the plurality of mirrors 230 and irradiate an observation area in which an eye point of a driver of a vehicle is located, thereby realizing directional irradiation of the image generation unit 240 based on the eye point of the driver of the vehicle.

[0047] In addition, the image generation unit can further include a light splitting device.

[0048] The light splitting device can be located on a side of the liquid crystal display screen 241 away from the backlight module 242. The light splitting device can split the initial light displayed by the liquid crystal display screen 241 to obtain a plurality of groups of split light, so that a three-dimensional display effect can be realized when the plurality of groups of light enter an eye.

[0049] It should be noted that if the plurality of light transmission elements included in the light path adjusting module of the backlight module 242 are holographic optical elements, the plurality of light transmission elements can be arranged in close contact with the liquid crystal display screen. Of course, each light transmission element in the backlight module 242 can also use other optical elements and different arrangement modes, and the type and arrangement mode of each light transmission element are not limited in the embodiments of the present application.

[0050] Specifically, the driver monitoring system 220 can confirm the observation area where the eye point of the user (such as the driver of the vehicle) is located through the built-in eye tracking device, that is, confirm the position of the light ray of the image displayed by the image generation unit 240 observed by the user through the eyes, so as to obtain the spatial position information corresponding to the observation area where the eye point is located.

[0051] Then, the driver monitoring system 220 can send the observation area where the eye point of the user is located to the processor 210. The processor 210 can determine the matching irradiation area of the observation area according to 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 irradiation area.

[0052] In addition, the processor 210 can generate a light emitting instruction according to the determined light emitting element. In addition, in the process of generating the light emitting instruction, the current parameter of the light emitting element corresponding to the observation area when the light emitting element emits light can also be determined according to the observation area where the eye point is located, so that the current parameter can also be added to the light emitting instruction. The current parameter is used to represent the brightness of the light emitting element when the light emitting element emits light.

[0053] Correspondingly, after receiving the light emitting instruction, the image generation unit 240 can emit light according to the light emitting element indicated by the light emitting instruction, and control the light emitting brightness of the light emitting element according to the current parameter carried by the light emitting instruction, so as to control the light emitting element corresponding to the observation area to emit the initial light ray according to the set current parameter, and then irradiate the observation area where the eye point of the user is located through the initial light ray, so as to realize the directional irradiation of the head-up display system.

[0054] It should be noted that the processor 210, the driver monitoring system 220 and the image generation unit 240 are taken as examples for data interaction in the embodiments of the present application, and in actual application, the processor 210 can be built-in in the driver monitoring system 220 or can be arranged in the vehicle, and the processor 210 is not limited in the embodiments of the present application.

[0055] For example, the processor 210 can be a data processing device of a car machine in a vehicle, and the car machine can receive an observation area corresponding to an eye point sent by the driver monitoring system 220, analyze the observation area in combination with an irradiation area corresponding to each lamp bead in the image generation unit 240, determine a lamp bead matched with the observation area information, and send a light-emitting instruction to the image generation unit 240 to instruct the light-emitting element (such as a lamp bead) matched with the spatial position information to emit light.

[0056] The structure of the backlight module in the image generation unit is described in detail below.

[0057] Figure 3 A structure diagram of a backlight module provided by an embodiment of the present application is shown in FIG. 3, which is used as an example and is not limited. Figure 3 The backlight module includes at least one light source module 310 and a light path adjustment module 320.

[0058] Each light source module 310 can include at least one light-emitting element 311.

[0059] Specifically, the light source module 310 can emit initial light through the at least one light-emitting element 311, and the light path adjustment module 320 can be located on the propagation path of the initial light to adjust the propagation angle of the initial light to obtain deflected light.

[0060] The irradiation area irradiated by the deflected light corresponds to the light-emitting element 311 emitting the initial light, and the irradiation areas corresponding to each light-emitting element 311 are all different.

[0061] Correspondingly, the backlight module can control the light-emitting element 311 corresponding to the irradiation area matched with the observation area to emit light according to the observation area where the eye point is located, irradiate the observation area, so that the deflected light irradiates the observation area, and realize the function of directional light emission according to the eye point.

[0062] The eye point is a position where a user observes the deflected light through the eyes.

[0063] For example, as shown in Figure 4A , Figure 4B and Figure 4C , Figure 4A , Figure 4B and Figure 4C are schematic diagrams of directional light emission according to an eye point provided by an embodiment of the present application, as shown in Figure 4A When the eye point is located in the observation area deviated to the left, the light-emitting element 311 (lamp bead with white background and black border in the figure) close to the right can emit light for irradiation, and other light-emitting elements 311 (lamp bead with black background and black border in the figure) do not emit light.

[0064] Similarly, as shown inFigure 4B As shown, when the eye point is located in the observation area deviated to the right, the light-emitting element 311 close to the left can emit light for irradiation, and other light-emitting elements 311 do not emit light. Further, as shown, Figure 4C As shown, when the eye point is located in the central observation area, the light-emitting element 311 close to the center can emit light for irradiation, and other light-emitting elements 311 do not emit light.

[0065] It should be noted that in actual application, the light source module 310 and the light path adjustment module 320 can include different optical components, and different arrangement modes can be adopted for different optical components to realize directional irradiation of the light-emitting element 311.

[0066] In an optional embodiment, Figure 5 Another structure diagram of the backlight module provided by the embodiment of the present application is shown in FIG. 3, which is used as an example and is not limited. As shown in FIG. 3, Figure 5 The at least one light source module 310 can include a plurality of light source modules 310, and each light source module 310 can include at least one light-emitting element 311.

[0067] The light path adjustment module 320 can include a light-reflecting element array 321, and the light-reflecting element array 321 can include a plurality of light-reflecting elements. The light-reflecting elements can be curved mirrors or light-reflecting cups, and the curved mirrors can be concave mirrors or convex mirrors.

[0068] Further, the plurality of light source modules 310 can correspond to the plurality of light-reflecting elements one by one. Correspondingly, for each light source module 310, the initial light emitted by the light source module 310 can be reflected by the corresponding light-reflecting element to obtain the deflected light.

[0069] In addition, the plurality of light-reflecting elements can be distributed around the plurality of light source modules 310 in a rotationally symmetrical manner, so that each light-reflecting element can reflect the initial light emitted by the corresponding light source module 310 to obtain the deflected light.

[0070] Specifically, the image generation unit can control the backlight module to determine the light-emitting element 311 that needs to emit light according to the accepted light-emitting instruction. Then, the backlight module can control the circuit in which the light-emitting element 311 is located to be turned on, so that the light-emitting element 311 emits light.

[0071] Correspondingly, for each determined light-emitting element 311 that needs to emit light, the initial light emitted by the light-emitting element 311 can pass through the light-reflecting element corresponding to the light-emitting element 311, and the initial light is reflected by the light-reflecting element to form the deflected light, so that the deflected light can accurately irradiate the irradiation area corresponding to the light-emitting element 311.

[0072] It should be noted that the above is described by taking the light emission of one light emitting element 311 in one light source module 310 as an example, and in actual application, the same irradiation area can be irradiated by the light emission of the light emitting elements 311 of multiple light source modules 310, and the number of light source modules 310 for light emission and the number of light emitting elements 311 for light emission are not limited in the embodiments of the present application.

[0073] The above is described by taking the light emission of the backlight module according to the received light emission instruction as an example, and the principle of directional light emission of the backlight module is introduced. In actual application, the backlight module can also periodically emit light through multiple light emitting elements 311 according to the pre-set instruction, so as to periodically irradiate multiple irradiation areas and realize the coverage of each observation area where the eye point is located.

[0074] Optionally, each light emitting element 311 in each light source module 310 can periodically emit initial light in turn, and each light emitting element 311 corresponds to a different irradiation area, so that each light emitting element 311 can periodically emit light to realize the irradiation of each irradiation area.

[0075] Moreover, the backlight module can include multiple light source modules 310, and the multiple light source modules 310 can emit light at the same time when the backlight module emits light, so that the same irradiation area or multiple irradiation areas can be irradiated by the multiple light source modules 310.

[0076] For example, when the light emitting elements 311 in each light source module 310 emit initial light at the same time, the multiple initial light can irradiate the same irradiation area, that is, in the current light emission period, the light emitting elements 311 in each light source module 310 emit light, and the corresponding irradiation areas are the same, so that the multiple light emitting elements 311 can emit light to improve the light intensity of the irradiation area.

[0077] Further, when the same irradiation area is irradiated by the 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 irradiate different irradiation areas, so that each irradiation area can be irradiated by one light source module 310.

[0079] Moreover, the backlight module can include multiple light source modules 310, and when the multiple light source modules 310 periodically emit light 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 irradiation area.

[0080] For example, the backlight module includes a plurality of light source modules 310, each of which includes 3 light emitting elements 311, and the plurality of light emitting elements 311 included in the plurality of light source modules 310 can be divided into three groups A, B and C.

[0081] Among them, each light emitting element 311 in group A is the first light bead from left to right covered by 5 columnar lenses, each light emitting element 311 in group B is the second light bead from left to right covered by 5 columnar lenses, and each light emitting element 311 in group C is the third light bead from left to right covered by 5 columnar lenses.

[0082] Correspondingly, if the irradiation area corresponding to group A is the observation area corresponding to the user's left eye, the irradiation area corresponding to group C is the observation area corresponding to the user's right eye. Moreover, due to the focusing effect of the columnar lens, the initial light emitted by group A is only the light that the user's left eye sees, and the initial light emitted by the remaining light emitting element 311 groups cannot be seen.

[0083] It should be noted that the above is an example of one light emitting element 311 in one light source module 310 emitting light, and in actual application, the plurality of light emitting elements 311 in one light source module 310 can periodically emit light to irradiate a plurality of irradiation areas. The number of light source modules 310 emitting light and the number of light emitting elements 311 emitting light are not limited in the present application.

[0084] The above is an example of the backlight module emitting light according to the received light emitting instruction, and the principle of directional light emission of the backlight module is introduced. In actual application, the backlight module can also periodically emit light through a plurality of light emitting elements 311 according to a pre-set instruction, so as to periodically irradiate a plurality of irradiation areas and realize coverage of each observation area where the eye point is located.

[0085] Correspondingly, the number of the plurality of reflecting elements in the reflecting array can be consistent with the number of the plurality of observation areas. That is, each light source module 310 can irradiate different irradiation areas, so as to irradiate each irradiation area through each light source module 310 and the corresponding reflecting element.

[0086] It should be noted that the arrangement direction of the plurality of observation areas can be consistent with the arrangement direction of the plurality of light source modules 310. For example, the plurality of observation areas are arranged in a horizontal manner, and the plurality of light source modules 310 can also be arranged in a horizontal manner, so that each light source module 310 irradiates each observation area.

[0087] Further, if the plurality of observation regions are arranged along the first direction and the second direction respectively, the plurality of light source modules 310 are arranged along the first direction and the second direction respectively. For example, if the plurality of observation regions are arranged along the horizontal direction and the vertical direction respectively, and an array is formed by the plurality of observation regions, the plurality of light source modules 310 can also be arranged along the horizontal direction and the vertical direction respectively, forming an array composed of the plurality of light source modules 310.

[0088] It should be noted that if each of the plurality of light source modules 310 arranged along the first direction and the second direction respectively can include a plurality of light emitting elements 311, the plurality of light emitting elements 311 in each of the light source modules 310 can be arranged along the first direction or the second direction, and the arrangement of each light emitting element 311 is not limited in the embodiments of the present application.

[0089] In addition, it should be noted that the optical path adjustment module 320 can include a light-transmitting element or a light-reflecting element, and if the optical path adjustment module 320 includes a light-transmitting element, the light-transmitting element can be a lens. For example, the lens can be a cylindrical lens or a Fresnel lens, and the specific type of the lens is not limited in the embodiments of the present application.

[0090] 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 the light emitting element 311 is not limited in the embodiments of the present application.

[0091] In summary, the backlight module provided in the embodiment of the present application comprises at least one light source module and a light path adjustment module. Each light source module comprises at least one light emitting element. The light source module emits initial light through the at least one light emitting element. The light 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 irradiation area irradiated by the deflected light corresponds to the light emitting element emitting the initial light. The irradiation area corresponding to each light emitting element is different. Moreover, the backlight module can control the light emitting element corresponding to the irradiation area matching the observation area to emit light according to the eye point in the observation area, so as to irradiate the observation area, so that the deflected light irradiates the observation area. The eye point is the position of the user observing the deflected light through the eyes. The scheme provided in the embodiment of the present application can adjust the propagation angle of the initial light emitted by each light emitting element through the light path adjustment module, so that the initial light emitted by each light emitting element can irradiate different areas to form the irradiation area corresponding to each light emitting element. Each irradiation area can correspond to different eye points of the user, so that different light emitting elements can be selected to emit light at different times according to different eye points of the vehicle driver. The energy consumption of the backlight module can be reduced, the heat dissipation of the backlight module can be improved, the screen temperature of the liquid crystal display screen adjacent to the backlight module can be reduced, and screen burn-in can be prevented.

[0092] Moreover, by sending light only to the area where the eye point of the user is located and turning off other light emitting elements, the crosstalk between the light emitted by each light emitting element can be reduced, so that the 2D effect or 3D effect imaged in the eyes of the user can be improved.

[0093] In addition, through the design of the directional backlight, stray light generated by light at other angles can be better prevented, and glare can be prevented.

[0094] In addition, in the heads-up display system, the current parameters required by each light emitting element when emitting light can be calculated by the processor. The luminance of the light emitting element can be adjusted through the size of the current parameter, so that the adaptability and flexibility of the heads-up display system when the vehicle is in different scenes can be improved.

[0095] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution. The execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0096] In the above embodiments, the description of each embodiment has its own emphasis. The parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0097] Those skilled in the art can appreciate that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person 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 the present application.

[0098] In the embodiments provided in the present application, it should be understood that the disclosed apparatuses / devices and methods can be implemented in other ways. For example, the above-described apparatus / device embodiments are merely illustrative. For example, the division of the modules or units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or in other forms.

[0099] It should be understood that when used in the specification and the appended claims of the present application, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0100] It should also be understood that the term "and / or" as used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof.

[0101] As used in the specification and the appended claims of the present application, the term "if" can be interpreted as "when" or "upon" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted as meaning "upon determining" or "in response to determining" or "upon detecting [a described condition or event]" or "in response to detecting [a described condition or event]" depending on the context.

[0102] In addition, in the description of the specification and the appended claims of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0103] 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.

[0104] 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 comprises a plurality of light source modules and a light reflection array. Each of the light source modules is configured to emit an initial light ray. The light reflection array is located on a propagation path of each of the initial light rays, and is configured to reflect each of the initial light rays to obtain a deflected light ray. The light reflection array is located on a propagation path of each of the initial light rays, and is configured to reflect each of the initial light rays to obtain a deflected light ray. Each of the light source modules corresponds to a different irradiation area, and each of the irradiation areas covers an observation area of an eye point.

2. The backlight module of claim 1, wherein, The backlight module is configured to control the light source modules corresponding to the observation area to emit light according to the eye point, so that the deflected light ray irradiates the observation area. The light reflection array comprises a plurality of light reflection elements, and each of the light reflection elements corresponds to each of the light source modules.

3. The backlight module of claim 2, wherein, For each of the light source modules, the initial light ray emitted by the light source module is reflected by the corresponding light reflection element to obtain the deflected light ray.

4. The backlight module of claim 1, wherein, The plurality of light reflection elements are distributed around the plurality of light source modules in a rotationally symmetric manner.

5. The backlight module of claim 1, wherein, The arrangement direction of the plurality of observation areas is consistent with the arrangement direction of the plurality of light source modules.

6. The backlight module of claim 1, wherein, If the plurality of observation areas are arranged along a first direction and a second direction, respectively, the plurality of light source modules are also arranged along the first direction and the second direction, respectively. The light reflection array comprises a plurality of light reflection elements.

7. The backlight module of claim 1, wherein, The number of the plurality of light reflection elements is consistent with the number of the plurality of observation areas.

8. The backlight module of claim 7, wherein, Each of the light source modules periodically emits the initial light ray in sequence. Each of the light source modules comprises at least one light emitting element.

9. The backlight module of claim 8, wherein, Each of the at least one light emitting element in each of the light source modules periodically emits the initial light ray in sequence.

10. The backlight module of any of claims 1 to 7, wherein, For each of the light source modules, each of the initial light rays emitted by each of the light emitting elements of the light source module irradiates the same irradiation area. The light reflection array comprises a plurality of light reflection elements.

11. The backlight module of claim 10, wherein, The light reflection element is a curved mirror or a light reflection cup.

12. The backlight module of any of claims 1-7, wherein, The curved mirror is a concave mirror or a convex mirror.

13. An image generation unit, characterized by comprising: The light emitting element is a light emitting diode or a micro light emitting diode. The image generation unit comprises a liquid crystal display screen and a backlight module as claimed in any one of claims 1 to 12. The backlight module is configured to generate an outgoing light ray.

14. A heads-up display system characterized by, The liquid crystal display screen is located on a propagation path of the outgoing light ray, and is configured to display an image according to the outgoing light ray. The head-up display system comprises a driver monitoring system, a plurality of mirrors, and an image generation unit as claimed in claim 13. The driver monitoring system is configured to determine an eye point position of a vehicle driver, and control the light emitting diode corresponding to the area where the eye point position is located in the image generation unit to emit light, so as to generate an outgoing light ray. The outgoing light ray is reflected by the plurality of mirrors, so that the reflected outgoing light ray irradiates the area where the eye point position is located.

15. The head-up display system of claim 14, wherein, The driver monitoring system comprises an eye tracking device for determining the eye point position of the vehicle driver.

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