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

Abstract

The invention provides a backlight module, an image generation unit, a head-up display system and a display method, and relates to the technical field of display. The backlight module 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 at least one light-emitting element, the light path adjusting module is located on the propagation path of the initial light and used for adjusting the propagation angle of the initial light to obtain deflected light, and the irradiation area irradiated by the deflected light corresponds to the light-emitting element emitting the initial light. In the technical scheme provided by the invention, different light-emitting elements are selected to emit light at different moments according to different eye points of a user, so that 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, 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), a head-up display (HUD) system and a display method. BACKGROUND

[0002] The HUD technology refers to a principle of optical reflection, which projects light emitted by an image source onto an imaging window (such as an imaging plate or a windshield glass, etc.), reflects the light into an eyebox via the imaging window, and forms a virtual image. The virtual image can display vehicle running information such as vehicle speed, so as to avoid distraction caused by the driver looking down at the instrument panel during driving. Naked-eye stereoscopic head-up display is a screen capable of naked-eye 3D display, which uses a light splitting device to split light into left and right eyes to realize naked-eye 3D display. By using the parallax characteristics of human eyes, a realistic stereoscopic image display system with space and depth can be obtained without any auxiliary equipment.

[0003] The existing AR / 3D head-up display device generally adopts a direct backlight system, which needs multiple components to perform operations such as light collection, direction control, light homogenization, etc. on the outgoing light of the light source, and then splits the light into left and right eyes by a light splitting device to make the light project into the eyebox area, so that the entire eyebox area can observe the image. However, the actual observation area of the human eye is much smaller than the designed eyebox area size. When the left and right eyes observe the image, the image brightness difference occurs, and the image observed by the left eye and the right eye produces crosstalk, the fusion stereoscopic display effect is poor, the contrast is low, and the crosstalk is large. Long-term use causes a large amount of power loss, and the high-power backlight system causes the screen to heat up, which causes screen burn-in and reduces the screen life. SUMMARY

[0004] The present application provides a backlight module, a picture generation unit, a head-up display system and a display method, which solves the problem that the observation area of the human eye is much smaller than the designed eyebox area size in the related art, the backlight system causes a large amount of power loss, and the two groups of light obtained by splitting the light can produce crosstalk, resulting in poor 3D display effect.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a backlight module, which comprises at least one light source module and a light path adjustment module.

[0007] Each of the light source modules comprises at least one light emitting element.

[0008] The light source module emits initial light rays through at least one of the light emitting elements, the light path adjustment module is located on a propagation path of the initial light rays, and is configured to adjust a propagation angle of the initial light rays to obtain deflected light rays, and the deflected light rays irradiate an irradiation area corresponding to the light emitting element emitting the initial light rays, and the irradiation area corresponding to each of the light emitting elements is different.

[0009] The backlight module is configured to control the light emitting elements corresponding to the irradiation area matching the observation area to emit light according to the observation area, so as to irradiate the observation area, so that the deflected light rays irradiate the observation area, and the eye point is a position at which a user observes the deflected light rays through eyes.

[0010] Optionally, the light path adjustment module comprises a collimating lens, a microlens array, and a light path deflection unit.

[0011] The collimating lens is located on the propagation path of the initial light rays, and is configured to adjust the propagation angle of the initial light rays to form collimated light rays.

[0012] The microlens array is located on the propagation path of the collimated light rays, and is configured to diverge the collimated light rays to obtain divergent light rays.

[0013] The light path deflection unit is located on the propagation path of the divergent light rays, and is configured to converge the divergent light rays to form the deflected light rays.

[0014] Optionally, the light path deflection unit comprises a first light path deflection subunit and / or a second light path deflection subunit.

[0015] The first light path deflection subunit is located on the propagation path of the divergent light rays, and is configured to adjust the propagation angle of the divergent light rays to form deflected light rays.

[0016] The second light path deflection subunit is located on the propagation path of the deflected light rays, and is configured to adjust the propagation angle of the deflected light rays to form the deflected light rays.

[0017] Optionally, the first light path deflection subunit and the second light path deflection subunit are both light-transmitting elements or light-reflecting elements.

[0018] If the first light path deflection subunit is the light-reflecting element, the second light path deflection subunit is the light-reflecting element.

[0019] Optionally, the light-transmitting element is a lens or a holographic optical element, and the light-reflecting element is a mirror or a reflective holographic optical element.

[0020] Optionally, the first light path deflection subunit is a first mirror, and the second light path deflection subunit comprises a second mirror and a reflective holographic optical element.

[0021] The second mirror and the reflective holographic optical element are arranged in abutment, and the reflective holographic optical element is located between the first mirror and the second mirror.

[0022] Optionally, the at least one light source module comprises a plurality of light source modules, and each light source module comprises a plurality of light emitting elements.

[0023] The light path adjustment module comprises a light-transmitting element array, and the light-transmitting element array comprises a plurality of light-transmitting elements.

[0024] Each light-transmitting element corresponds to a plurality of light emitting elements.

[0025] For each light-transmitting element, the light-transmitting element is located on a light path of initial light emitted by the corresponding plurality of light emitting elements, and is configured to adjust a propagation angle of the initial light to obtain the deflected light.

[0026] Optionally, each light emitting element in each light source module periodically emits the initial light in turn.

[0027] Optionally, when each light source module simultaneously emits the initial light through the light emitting elements, a plurality of initial lights irradiate the same irradiation area.

[0028] Optionally, the number of light emitting elements in each light source module is consistent with the number of observation areas.

[0029] Optionally, the at least one light source module comprises a plurality of light source modules, and each light source module comprises at least one light emitting element.

[0030] The light path adjustment module comprises a light-reflecting element array, and the light-reflecting element array comprises a plurality of light-reflecting elements.

[0031] The plurality of light source modules correspond one-to-one to the plurality of light-reflecting elements.

[0032] For each light source module, the initial light emitted by the light source module is reflected by the corresponding light-reflecting element to obtain the deflected light.

[0033] Optionally, the plurality of light-reflecting elements are distributed around the plurality of light source modules in a rotationally symmetrical manner.

[0034] Optionally, the number of the plurality of reflective elements in the reflective array is consistent with the number of the plurality of observation areas.

[0035] Optionally, the reflective element is a curved mirror or a reflective cup.

[0036] Optionally, the curved mirror is a concave mirror or a convex mirror.

[0037] Optionally, the arrangement direction of the plurality of observation areas is consistent with the arrangement direction of the plurality of light source modules.

[0038] 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.

[0039] Optionally, if the light source module includes a plurality of light emitting elements, the plurality of light emitting elements in each light source module are arranged along the first direction or the second direction.

[0040] Optionally, if the light path adjustment module includes at least one lens, the lens is a cylindrical lens or a Fresnel lens.

[0041] Optionally, the light emitting element is a light emitting diode or a micro light emitting diode.

[0042] In a second aspect, an embodiment of the present application provides an image generation unit, the image generation unit comprising: a liquid crystal display screen and the backlight module according to any one of the first aspect.

[0043] The backlight module is configured to generate initial light rays.

[0044] The liquid crystal display screen is located on a propagation path of the initial light rays and is configured to display images according to the emergent light rays.

[0045] Optionally, if the light path adjustment module includes a plurality of light-transmitting elements which are holographic optical elements, the plurality of light-transmitting elements are arranged in contact with the liquid crystal display screen.

[0046] Optionally, the image generation unit further comprises a light splitting device.

[0047] The light splitting device is located on a side of the liquid crystal display screen away from the backlight module.

[0048] The light splitting device is configured to split the initial light rays displayed by the liquid crystal display screen to obtain a plurality of groups of split light rays, so as to achieve a three-dimensional display effect through the plurality of groups of split light rays.

[0049] In a third aspect, an embodiment of the present application provides a head-up display system, characterized in that the head-up display system comprises a processor, a driver monitoring system, a plurality of mirrors, and an image generation unit as described in the second aspect;

[0050] The driver monitoring system is configured to determine an observation area in which an eye point is located, the eye point being a position at which a user observes a deflected light ray through an eye;

[0051] The processor is configured to determine an irradiation area matched with the observation area in which the eye point is located.

[0052] The processor is further configured to determine a light emitting element corresponding to the irradiation area.

[0053] The processor is further configured to send a light emitting instruction to the image generation unit, the light emitting instruction being used to instruct the light emitting element corresponding to the observation area in the image generation unit to emit an initial light ray.

[0054] The image generation unit is configured to control the light emitting element corresponding to the observation area to emit the initial light ray according to the light emitting instruction.

[0055] Optionally, the driver monitoring system comprises an eye movement tracking device configured to determine the observation area corresponding to the eye point of the user.

[0056] Optionally, the processor is further configured to determine a current parameter of the light emitting element corresponding to the observation area in which the eye point is located when the light emitting element emits light, the current parameter being used to represent a brightness of the light emitting element when the light emitting element emits light.

[0057] In a fourth aspect, an embodiment of the present application provides a display method, characterized in that the display method is applied to the processor in the head-up display system as described in any one of the third aspect, and the display method comprises:

[0058] receiving position information sent by the driver monitoring system, the position information being used to represent an observation area in which an eye point is located, the eye point being a position at which a user observes a deflected light ray through an eye;

[0059] determining a light emitting element corresponding to the observation area according to the position information;

[0060] generating and sending a light emitting instruction to an image generation unit according to the light emitting element corresponding to the observation area, the light emitting instruction being used to instruct the light emitting element corresponding to the observation area in the image generation unit to emit an initial light ray, the initial light ray being obtained by light path adjustment of the deflected light ray.

[0061] Optionally, the determining the light-emitting element corresponding to the observation area according to the position information comprises:

[0062] determining the illumination area matched with the observation area according to the position information;

[0063] determining the light-emitting element corresponding to the illumination area according to the illumination area.

[0064] Optionally, the generating the light-emitting instruction according to the light-emitting element corresponding to the observation area comprises:

[0065] calculating the current parameter of the light-emitting element when emitting light according to the position of the observation area, the current parameter being used to represent the brightness of the light-emitting element when emitting light;

[0066] generating the light-emitting instruction according to the light-emitting element corresponding to the observation area and the current parameter of the light-emitting element when emitting light.

[0067] The backlight module provided by the embodiment of the present application comprises at least one light source module and a light path adjusting 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 adjusting 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 irradiated by the deflected light corresponds to the light-emitting element emitting the initial light, and the illumination areas corresponding to the light-emitting elements are all different. Moreover, the backlight module can control the light-emitting element corresponding to the illumination area matched with the observation area of the eye point to emit light according to the observation area of the eye point, irradiate the observation area, and make the deflected light irradiate the observation area, the eye point being the position of the user observing the deflected light through the eyes. The scheme provided by the embodiment of the present application is that the initial light emitted by each light-emitting element is adjusted by the light path adjusting module to adjust the propagation angle of the initial light, so that the initial light emitted by each light-emitting element can irradiate different areas to form the illumination area corresponding to each light-emitting element, and each illumination area can correspond to different eye points of the user, so that different light-emitting elements can be selected to emit light at different time according to the different eye points of the user, 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 the screen burn-in of the screen can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1A FIG. 1 is a structural schematic diagram of a HUD in the prior art;

[0069] Figure 1B FIG. 2 is a structural schematic diagram of a PGU in the prior art;

[0070] Figure 2A structure diagram of a head-up display system in which an image generation unit of a backlight module provided by an embodiment of the present application is located;

[0071] Figure 3 A structure diagram of a backlight module provided by an embodiment of the present application;

[0072] Figure 4A 、 Figure 4B and Figure 4C are schematic diagrams of directional light emission according to eye points provided by an embodiment of the present application;

[0073] Figure 5 A structure diagram of another backlight module provided by an embodiment of the present application;

[0074] Figure 6 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0075] Figure 7 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0076] Figure 8 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0077] Figure 9 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0078] Figure 10 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0079] Figure 11 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0080] Figure 12 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0081] Figure 13 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0082] Figure 14 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0083] Figure 15 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0084] Figure 16 A structure diagram of still another backlight module provided by an embodiment of the present application;

[0085] Figure 17FIG. 2 is a schematic diagram of another structure of a backlight module according to an embodiment of the present application;

[0086] Figure 18 FIG. 4 is a flowchart of a display method according to an embodiment of the present application. DETAILED DESCRIPTION

[0087] In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular structures, 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, structures and devices are omitted so as not to obscure the description of the present application with unnecessary detail.

[0088] 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 specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0089] The HUD technology refers to a principle of optical reflection, which projects light rays emitted by an image source onto an imaging window (such as an imaging plate or a windshield, etc.), and reflects the light rays into an eyebox via the imaging window to form a virtual image. The virtual image can display vehicle driving information such as vehicle speed, so as to avoid distraction caused by the driver looking down at the instrument panel during driving.

[0090] In the related art, the backlight source of the HUD can adopt a direct backlight system, which can perform light collection, direction control, light homogenization, etc. on the outgoing light rays of the light source through multiple components, so that the light rays can be projected into the eyebox region, and the entire eyebox region can observe the image. Moreover, a grating can be added to split the light rays, so that the two groups of light rays obtained by splitting the light rays are imaged in the left eye and the right eye of the human eye respectively, thereby realizing 3D imaging.

[0091] Specifically, referring to Figure 1A and Figure 1B Taking a vehicle-mounted HUD as an example, the HUD can include a PGU 110, a cylindrical grating 120 attached to a liquid crystal display (LCD) in the PGU, and a mirror assembly 130 (such as a mirror 1 and a mirror 2 shown in Figure 1A ). Figure 1BAs shown, the PGU 110 can include an LCD 111 and a backlight module 112, the LCD 111 can include a polarizer, a glass substrate, a color filter (CF), liquid crystal and a polarizer, and the backlight module 112 can include a lamp plate, an LED lamp total internal reflection lens and a microlens array.

[0092] However, in actual application, the observation area of the human eye is much smaller than the size of the designed eyebox area, and such a backlight system can cause a large loss of power consumption. Moreover, by selecting a screen with high resolution and increasing the brightness of the backlight, the cost and heat management problems can be caused. In addition, the light splitting can cause crosstalk and poor 3D display effect.

[0093] Therefore, the embodiment of the present application provides a backlight module, which includes at least one light source module and a light path adjustment module. Each light source module includes at least one light emitting element, and 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 matched with the observation area of the eye point to emit light according to the observation area, so as to irradiate the observation area with the deflected light. The eye point is the position of the user observing the deflected light through the eyes. The embodiment of the present application provides the scheme, the initial light emitted by each light emitting element is adjusted by the light path adjustment module to adjust the propagation angle of the initial light, 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 time 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 the screen burn-in can be prevented.

[0094] 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.

[0095] Referring to Figure 2 , Figure 2 A structure schematic diagram of a head-up display system in which an image generation unit of a backlight module provided by the 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.

[0096] The image generating unit 240 can include a liquid crystal display screen 241 and a backlight module 242.

[0097] 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 the light of the displayed image can be reflected by the plurality of mirrors 230 and irradiate an observation area where an eye point of a user (e.g., a driver) is located, thereby realizing directional irradiation of the image generating unit 240 based on the eye point of the user.

[0098] In addition, the image generating unit can further include a light splitting device.

[0099] 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 the human eye.

[0100] It should be noted that if the plurality of light-transmitting elements included in the light path adjusting module of the backlight module 242 are holographic optical elements, the plurality of light-transmitting elements can be arranged in a manner of being attached to the liquid crystal display screen. Of course, each light-transmitting element in the backlight module 242 can also use other optical elements and different arrangement manners, and the type and arrangement manner of each light-transmitting element are not limited in the embodiments of the present application.

[0101] Specifically, the driver monitoring system 220 can confirm the observation area where the eye point of the user (e.g., a driver of a vehicle) is located through the built-in eye movement tracking device, that is, confirm the position of the light of the image displayed by the image generating unit 240 observed by the user through the eyes, so as to obtain spatial position information corresponding to the observation area where the eye point is located.

[0102] 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 a matching irradiation area of the observation area where the eye point is located, and then determine corresponding light emitting elements of the backlight module 242 based on the irradiation area.

[0103] In addition, the processor 210 can generate a light emitting instruction according to the determined light emitting elements. In addition, in the process of generating the light emitting instruction, the current parameter of the light emitting element corresponding to the observation area where the eye point is located when the light emitting element emits light can also be determined, 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.

[0104] Correspondingly, the image generation unit 240 can emit light according to the light-emitting element indicated by the light-emitting instruction after receiving 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 initial light 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, so as to realize directional irradiation of the head-up display system.

[0105] 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 embodiments of the present application do not make specific limitation to the processor 210.

[0106] For example, the processor 210 can be a data operation device of a car machine in the vehicle, and then the car machine can receive the observation area corresponding to the eye point sent by the driver monitoring system 220, analyze the observation area in combination with the irradiation area corresponding to each lamp bead in the image generation unit 240, determine the lamp bead matched with the observation area information, and then send a light-emitting instruction to the image generation unit 240 to indicate the light-emitting element (such as the lamp bead) matched with the spatial position information to emit light.

[0107] The structure of the backlight module in the image generation unit will be described in detail below.

[0108] Figure 3 A structure schematic diagram of a backlight module provided by the embodiments of the present application is taken as an example but not limitation, and see Figure 3 The backlight module includes at least one light source module 310 and a light path adjustment module 320.

[0109] Each light source module 310 can include at least one light-emitting element 311.

[0110] 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.

[0111] The irradiation area irradiated by the deflected light corresponds to the light-emitting element 311 emitting the initial light, and the irradiation area corresponding to each light-emitting element 311 is different.

[0112] Correspondingly, the backlight module can control the light-emitting elements 311 corresponding to the illumination area matching the observation area according to the eye point to emit light, irradiate the observation area, and make the deflected light irradiate the observation area, thereby realizing the function of directional light emission according to the eye point.

[0113] The eye point is a position at which a user observes the deflected light through the eyes.

[0114] 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 the embodiments 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 elements 311 (lamp beads with white background and black edges in the figure) close to the right can emit light for irradiation, and other light-emitting elements 311 (lamp beads with black background and black edges in the figure) do not emit light.

[0115] Similarly, as shown in Figure 4B , when the eye point is located in the observation area deviated to the right, the light-emitting elements 311 close to the left can emit light for irradiation, and other light-emitting elements 311 do not emit light. Further, as shown in Figure 4C , when the eye point is located in the central observation area, the light-emitting elements 311 close to the center can emit light for irradiation, and other light-emitting elements 311 do not emit light.

[0116] It should be noted that in actual applications, the light source module 310 and the light path adjustment module 320 can include different optical elements, and different arrangement modes can be adopted for different optical elements to realize directional irradiation of the light-emitting elements 311.

[0117] Therefore, the present application can provide various combination modes of the light source module 310 and / or the light path adjustment module 320, and the following describes various combination modes of the light source module 310 and / or the light path adjustment module 320.

[0118] Mode one

[0119] Figure 5 Another structure schematic diagram of a backlight module provided by the embodiments of the present application is provided as an example but not limitation, and as shown in Figure 5 , the light path adjustment module 320 of the backlight module can include a collimating lens 321, a microlens array 322, and a light path deflection unit 323.

[0120] The collimating lens 321 can be located on the propagation path of the initial light rays, and adjusts the propagation angle of the initial light rays to form collimated light rays. Correspondingly, the microlens array 322 can be located on the propagation path of the collimated light rays, and is configured to diverge the collimated light rays to obtain divergent light rays. Further, the light path deflection unit 323 can be located on the propagation path of the divergent light rays, and is configured to converge the divergent light rays to form deflected light rays, so that the deflected light rays corresponding to each light emitting element 311 can irradiate the irradiation area corresponding to the light emitting element 311.

[0121] Since each irradiation area corresponds to a different eye point, when the user's eye point is in different positions, the corresponding light emitting element 311 can be used for irradiation, thereby avoiding the problem of energy loss and temperature rise caused by simultaneous irradiation of multiple light emitting elements 311, and the power consumption of the backlight module can be improved.

[0122] 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 received 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.

[0123] Correspondingly, the initial light rays emitted by the light emitting element 311 can first pass through the collimating lens 321, and the collimating lens 321 adjusts the propagation direction of the initial light rays to form collimated light rays. With the continuous propagation of the collimated light rays, the microlens array 322 can be used to diverge the collimated light rays to make the propagation angle of the collimated light rays deflected to form divergent light rays, so as to irradiate the irradiation area corresponding to the light emitting element 311.

[0124] Then, the divergent light rays can pass through the light path deflection unit 323 during propagation, and the light path deflection unit 323 can further adjust and converge the propagation direction of the divergent light rays to obtain deflected light rays, so that the deflected light rays can accurately irradiate the irradiation area corresponding to the light emitting element 311.

[0125] It should be noted that, in the embodiments of the present application, the image generation unit controls the light emitting element 311 to emit light according to the light emitting instruction, but in actual application, the backlight module can also periodically control multiple light emitting elements 311 to emit light, so that the user's eye point can see the image generated by the image generation unit at any time and in any area.

[0126] Further, Figure 6 Another structure diagram of the backlight module provided by the embodiments of the present application is shown in FIG. 3, which is used as an example and is not limited. As shown in FIG. 3, the backlight module can include a light emitting element 311, a collimating lens 321, a microlens array 322, and a light path deflection unit 323. Figure 6 The light path deflection unit 323 can include a first light path deflection subunit 323a and / or a second light path deflection subunit 323b.

[0127] The first light path deflection sub-unit 323a can be located on the propagation path of the divergent light rays, and is configured to adjust the propagation angle of the divergent light rays to form deflected light rays. Correspondingly, if the light path deflection unit 323 includes a second light path deflection sub-unit 323b, the second light path deflection sub-unit 323b can be located on the propagation path of the deflected light rays, and is configured to adjust the propagation angle of the deflected light rays to form folded light rays.

[0128] Considering that the image generation unit can be arranged at different positions in the vehicle space, the first light path deflection sub-unit 323a and / or the second light path deflection sub-unit 323b can converge and reflect the divergent light rays to form the folded light rays. Thus, the image generated by the image generation unit arranged at any position in the vehicle space can be deflected to the observation region of the eye point by adjusting the deflection angle of the divergent light rays by the first light path deflection sub-unit 323a and / or the second light path deflection sub-unit 323b.

[0129] Therefore, the first light path deflection sub-unit 323a and the second light path deflection sub-unit 323b can be combined to form a plurality of light path deflection units 323 based on different optical elements.

[0130] Optionally, the first light path deflection sub-unit 323a and the second light path deflection sub-unit 323b can be light-transmitting elements or light-reflecting elements. Moreover, if the first light path deflection sub-unit 323a is a light-reflecting element, the second light path deflection sub-unit 323b can be a light-reflecting element.

[0131] The light-transmitting element can be a lens or a holographic optical element, and the light-reflecting element can be a mirror or a reflective holographic optical element.

[0132] Correspondingly, the light path deflection unit 323 can be combined in a plurality of ways according to whether the second light path deflection sub-unit 323b is included and different optical elements are used for the first light path deflection sub-unit 323a and the second light path deflection sub-unit 323b, thereby forming a plurality of light path deflection units 323.

[0133] The various light path deflection units 323 are described in detail below.

[0134] First light path deflection unit

[0135] Referring to Figure 7 , Figure 7 FIG. 6 is a structural schematic diagram of another backlight module provided by an embodiment of the present application. The first light path deflection sub-unit 323a can be a light-transmitting element, and the second light path deflection sub-unit 323b can be a light-reflecting element.

[0136] Specifically, after the collimated light rays are diverged by the microlens array 322, the diverged light rays can be first converged by the first light path deflection subunit 323a to obtain deflected light rays. Then, the deflected light rays are reflected by the second light path deflection subunit 323b with an adjusted angle to obtain deflected light rays, so that the area irradiated by the deflected light rays is consistent with the irradiation area corresponding to the light emitting element 311.

[0137] It should be noted that in actual applications, the first light path deflection subunit 323a can include a plurality of light-transmitting elements, and a lens group is formed by the plurality of light-transmitting elements. Referring to Figure 8 , Figure 8 For another structure diagram of the backlight module provided by the embodiment of the present application, the first light path deflection subunit 323a can include a light-transmitting element A and a light-transmitting element B, the light-transmitting element A and the light-transmitting element B can form a lens group, and the size of the light-transmitting element A is smaller than the size of the light-transmitting element B. For example, as shown in Figure 8 For example, as shown in the figure, the cross sections of the light-transmitting element A and the light-transmitting element B are both circular, and the diameter of the light-transmitting element A is smaller than the diameter of the light-transmitting element B.

[0138] Further, referring to Figure 9 , Figure 9 For another structure diagram of the backlight module provided by the embodiment of the present application, the microlens array 322 includes a plurality of array partitions 322a.

[0139] Each array partition 322a can direct the collimated light rays to diverge to obtain diverged light rays. That is, after a plurality of collimated light rays enter a certain array partition 322a at a plurality of different angles, they can all exit at the same angle to form diverged light rays with the same propagation angle.

[0140] Therefore, during the adjustment of the first light path deflection subunit 323a and / or the second light path deflection subunit 323b, the array partitions 322a in the microlens array 322 can also be set, so that the matching degree between the irradiation area corresponding to each light emitting element 311 and the deflected light rays emitted by the lamp bead 310 can be further improved, and the matching degree between the area irradiated by the diverged light rays obtained by each array partition 322a and the observation area where each eye point is located can be further improved.

[0141] Second light path deflection subunit

[0142] Referring to Figure 10 , Figure 10As shown in FIG. 13, the first light path deflection sub-unit 323a and the second light path deflection sub-unit 323b can be light-transmitting elements. For example, the first light path deflection sub-unit 323a can be a light-transmitting element A, and the second light path deflection sub-unit 323b can be a light-transmitting element B.

[0143] Correspondingly, the light-transmitting element A and the light-transmitting element B can form a lens group, and the size of the light-transmitting element A is smaller than the size of the light-transmitting element B. For example, as shown in FIG. 14, taking the cross sections of the light-transmitting element A and the light-transmitting element B as circular shapes as an example, the diameter of the light-transmitting element A is smaller than the diameter of the light-transmitting element B. Figure 9

[0144] Specifically, the light-transmitting element A can be located on the propagation path of the divergent light rays. When the divergent light rays pass through the light-transmitting element A, the light-transmitting element A can converge the divergent light rays to form deflected light rays. Then, the deflected light rays can pass through the light-transmitting element B located on the propagation path of the deflected light rays, and the light-transmitting element B can converge the deflected light rays again to form deflected light rays, so that the deflected light rays propagate to the corresponding irradiation area of the light-emitting element 311.

[0145] As shown in FIG. 15, the backlight module is similar to the backlight module shown in FIG. 13, and details are not repeated here. Figure 9 Figure 11 Figure 11 As shown in FIG. 16, the backlight module provided by the embodiment of the present application is a structure schematic diagram of a backlight module, and the micro-lens array 322 of the second light path deflection unit can also include a plurality of array partitions 322a.

[0146] Since the plurality of array partitions 331 of the micro-lens array in the second light path adjustment module play a similar role to the plurality of array partitions 331 of the micro-lens array in the first light path adjustment module, details are not repeated here.

[0147] As shown in FIG. 17, the backlight module provided by the embodiment of the present application is a structure schematic diagram of a backlight module, and the third light path deflection unit can include a plurality of array partitions 323a.

[0148] As shown in FIG. 18, the backlight module provided by the embodiment of the present application is a structure schematic diagram of a backlight module, and the first light path deflection sub-unit 323a and the second light path deflection sub-unit 323b can be reflective elements. For example, the first light path deflection sub-unit 323a can be a first mirror X, and the second light path deflection sub-unit 323b can be a second mirror Y. Figure 12 Figure 12

[0149] ​​​​​The first reflector X can be located on the propagation path of the divergent light rays and used to reflect the divergent light rays to form deflected light rays. The second reflector Y can be located on the propagation path of the deflected light rays and used to reflect the deflected light rays again to form deflected light rays, so that the deflected light rays corresponding to each light emitting element 311 can irradiate the irradiation area corresponding to each light emitting element 311.

[0150] After the collimated light rays are diverged by the microlens array 322, the propagation angle of the divergent light rays can be adjusted for the first time by the first reflector X, and the propagation angle of the deflected light rays can be adjusted for the second time by the second reflector Y to obtain deflected light rays, so that the irradiation area corresponding to the light emitting element 311 can be irradiated by the deflected light rays.

[0151] The fourth light path deflection unit

[0152] Referring to Figure 13 , Figure 13 The structure diagram of another backlight module provided by the embodiment of the present application is shown in FIG. 6. The light path deflection unit 323 only includes the first light path deflection subunit 323a, and the first light path deflection subunit 323a can be a reflective element, for example, the reflective element can be a reflective holographic optical element.

[0153] Specifically, the first light path deflection subunit 323a can be located on the propagation path of the divergent light rays and used to reflect the divergent light rays to form deflected light rays, so that the deflected light rays corresponding to each light emitting element 311 can irradiate the irradiation area corresponding to each light emitting element 311, thereby achieving irradiation of the observation area where different eye points are located.

[0154] The fifth light path deflection unit

[0155] Referring to Figure 14 , Figure 14 The structure diagram of another backlight module provided by the embodiment of the present application is shown in FIG. 6. The first light path deflection subunit 323a can be a reflective element, and the second light path deflection subunit 323b can be a plurality of reflective elements.

[0156] For example, the first light path deflection subunit 323a can be a first reflector X, and the second light path deflection subunit 323b can include a second reflector Y and a reflective holographic optical element. The second reflector Y and the reflective holographic optical element are arranged in close contact, and the reflective holographic optical element is located between the first reflector X and the second reflector Y.

[0157] Specifically, the first mirror X can be located on the propagation path of the divergent light rays, for reflecting the divergent light rays to form deflected light rays. The reflectively holographic optical element and the second mirror Y arranged in a manner of fitting can be located on the propagation path of the deflected light rays, for reflecting the deflected light rays again to form deflected light rays, so that the deflected light rays corresponding to each light emitting element 311 irradiate the irradiation area corresponding to each light emitting element 311.

[0158] Specifically, after the collimated light rays are diverged by the microlens array 322, the propagation angle of the divergent light rays can be adjusted for the first time by the first mirror X, and the propagation angle of the first reflected light rays can be adjusted for the second time by the reflectively holographic optical element 341c to obtain deflected light rays, so that the irradiation area corresponding to the light emitting element 311 can be irradiated by the deflected light rays.

[0159] Moreover, when the deflected light rays irradiate the reflectively holographic optical element, part of the deflected light rays can pass through the reflectively holographic optical element to irradiate the second mirror Y, so that the deflected light rays passing through the reflectively holographic optical element can be reflected by the second mirror Y to form deflected light rays, so as to improve the reflectivity of the reflectively holographic optical element.

[0160] Mode two

[0161] Figure 15 Another structure schematic diagram of a backlight module provided by an embodiment of the present application is provided, which is used as an example but not limited, and see Figure 15 The at least one light source module 310 can include: a plurality of light source modules 310, and each light source module 310 includes: a plurality of light emitting elements 311.

[0162] Moreover, the light path adjusting module 320 can include: a light transmitting element array 324, and the light transmitting element array 324 includes: a plurality of light transmitting elements.

[0163] Correspondingly, for each light transmitting element, the light transmitting element can be located on the light path of the initial light rays emitted by the corresponding plurality of light emitting elements 311, for adjusting the propagation angle of the initial light rays to obtain deflected light rays.

[0164] Specifically, the image generating unit can control the backlight module to determine at least one light emitting element 311 that needs to emit light rays at present according to the accepted light emitting instruction. Then, the backlight module can control the circuit in which the at least one light emitting element 311 is located to be turned on, so that the at least one light emitting element 311 emits light.

[0165] 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 transmitting element corresponding to the light emitting element 311, the propagation angle of the initial light is adjusted by the light transmitting element, the deflected light is formed, and the deflected light can accurately irradiate the irradiation area corresponding to the light emitting element 311.

[0166] It should be noted that the above is described by taking the light emitted by 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 emitting elements 311 of multiple light source modules 310, and the number of light source modules 310 and the number of light emitting elements 311 are not limited in the embodiment of the application.

[0167] The above is described by taking the backlight module emitting light according to the received light emitting 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 by multiple light emitting elements 311 according to the pre-set instruction, so as to periodically irradiate multiple irradiation areas and realize coverage of each observation area where the eye point is located.

[0168] 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 irradiation area can be irradiated by periodically emitting light by each light emitting element 311.

[0169] 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.

[0170] For example, when the multiple light source modules 310 emit initial light by the light emitting elements 311 at the same time, the multiple initial lights can irradiate the same irradiation area, that is, in the current light emitting 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 emit light to improve the light intensity of the irradiation area.

[0171] 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.

[0172] That is, for each light source module 310, the plurality of light emitting elements 311 in the light source module 310 can irradiate different irradiation areas respectively, so that each irradiation area can be irradiated by one light source module 310.

[0173] Moreover, the backlight module can include a plurality of light source modules 310, and when the plurality of light source modules 310 periodically emit light at the same time, the plurality of 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.

[0174] For example, referring to Figure 16 , Figure 16 A structure diagram of another backlight module provided by the embodiment of the present application is provided, the backlight module includes a plurality of light source modules 310, each light source module 310 includes three 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.

[0175] Among them, each light emitting element 311 in the A group is the first light bead from left to right covered by the 5 columnar lenses, each light emitting element 311 in the B group is the second light bead from left to right covered by the 5 columnar lenses, and each light emitting element 311 in the C group is the third light bead from left to right covered by the 5 columnar lenses.

[0176] Correspondingly, if the irradiation area corresponding to the A group is the observation area corresponding to the left eye of the user, the irradiation area corresponding to the C group is the observation area corresponding to the right eye of the user. Moreover, since the columnar lens has the focusing effect, the initial light emitted by the A group is only the light displayed by the image content seen by the irradiation area (the left eye of the user) corresponding to the A group, and cannot see the initial light emitted by the rest of the light emitting element 311 group.

[0177] Mode three

[0178] Figure 17 A structure diagram of another backlight module provided by the embodiment of the present application is provided, as an example but not limitation, referring to Figure 17 Similarly to mode two, at least one light source module 310 can also include a plurality of light source modules 310, and each light source module 310 can include at least one light emitting element 311.

[0179] However, the light path adjusting module 320 can include a light reflecting element array 325, and the light reflecting element array 325 can include a plurality of light reflecting elements, wherein the light reflecting element can be a curved mirror or a light reflecting cup, and the curved mirror can be a concave mirror or a convex mirror.

[0180] Moreover, 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.

[0181] 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.

[0182] Specifically, the image generation unit can control the backlight module to determine, according to the accepted light-emitting instruction, the light-emitting element 311 that needs to emit light at present according to the light-emitting instruction. Then, the backlight module can control the circuit in which the light-emitting element 311 is located to be conductive, so that the light-emitting element 311 emits light.

[0183] 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.

[0184] It should be noted that the above describes the light-emitting 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-emitting elements 311 of the plurality of light source modules 310, and the number of light source modules 310 and the number of light-emitting elements 311 are not limited in the embodiment of the application.

[0185] The above describes the light-emitting of the backlight module according to the received light-emitting instruction as an example, and the principle of directional light-emitting of the backlight module is introduced. In actual application, the backlight module can also periodically emit light by the plurality of light-emitting elements 311 according to the pre-set instruction, so as to periodically irradiate the plurality of irradiation areas and realize the coverage of each observation area where the eye point is located.

[0186] Optionally, each light-emitting element 311 in each light source module 310 can periodically emit the initial light in turn, and each light-emitting element 311 corresponds to a different irradiation area, so that each irradiation area can be irradiated by the periodic light-emitting of each light-emitting element 311.

[0187] Moreover, the backlight module can include a plurality of light source modules 310, and the plurality of light source modules 310 can emit light at the same time when the backlight module emits light, so as to irradiate the same irradiation area or a plurality of irradiation areas by the plurality of light source modules 310.

[0188] For example, when each light source module 310 emits initial light rays simultaneously through the light emitting elements 311, the multiple initial light rays can irradiate the same irradiation area, that is, in the current light emitting period, the light emitting elements 311 in each light source module 310 emit light to the same corresponding irradiation area, so that the light intensity of the irradiation area can be improved by multiple light emitting elements 311 emitting light.

[0189] Further, when the same irradiation area is irradiated by 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.

[0190] 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 respectively, so that each irradiation area can be irradiated by one light source module 310.

[0191] Moreover, the backlight module can include multiple light source modules 310, and when the multiple light source modules 310 emit light periodically at the same time, the multiple light emitting elements 311 emitting 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.

[0192] For example, 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.

[0193] 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.

[0194] Correspondingly, if the irradiation area corresponding to group A is the observation area corresponding to the left eye of the user, the irradiation area corresponding to group C is the observation area corresponding to the right eye of the user. Moreover, since the columnar lens has the function of focusing, the initial light rays emitted by group A are only the light rays displayed by the image content seen by the irradiation area corresponding to group A (the left eye of the user), and cannot see the initial light rays emitted by the remaining groups of light emitting elements 311.

[0195] It should be noted that the above is described by taking one light emitting element 311 in one light source module 310 as an example, and in actual application, multiple light emitting elements 311 in one light source module 310 can emit light periodically to irradiate multiple irradiation areas, and the number of light source modules 310 emitting light and the number of light emitting elements 311 emitting light are not limited in the embodiments of the present application.

[0196] The above takes the backlight module emitting light according to the received light emitting instruction as an example, and introduces the principle of directional light emission of the backlight module. In actual application, the backlight module can also periodically emit light through the plurality of light emitting elements 311 according to the pre-set instruction, so as to periodically irradiate the plurality of irradiation areas and realize coverage of each observation area where the eye point is located.

[0197] Correspondingly, the number of the plurality of light reflecting elements in the light 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 that each irradiation area can be irradiated by each light source module 310 and the corresponding light reflecting element.

[0198] The above describes in detail that the light source module 310 and / or the light path adjusting module 320 respectively adopt different combinations of different optical elements. Of course, in actual application, the light source module 310 and / or the light path adjusting module 320 can also adopt different combinations of other different optical elements, and the embodiments of the present application will not be repeated here.

[0199] The arrangement of each observation area where the eye point is located and each light source module 310 will be described below.

[0200] Optionally, 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 adopt a horizontal arrangement manner, and the plurality of light source modules 310 can also adopt a horizontal arrangement manner, so that each light source module 310 irradiates each observation area.

[0201] Further, if the plurality of observation areas are arranged along the first direction and the second direction respectively, the plurality of light source modules 310 are also arranged along the first direction and the second direction respectively. For example, the plurality of observation areas are arranged along the horizontal direction and the vertical direction respectively, and the plurality of observation areas form an array, then the plurality of light source modules 310 can also be arranged along the horizontal direction and the vertical direction respectively, and form an array composed of the plurality of light source modules 310.

[0202] It should be noted that if each light source module 310 in the plurality of light source modules 310 arranged along the first direction and the second direction respectively includes a plurality of light emitting elements 311, the plurality of light emitting elements 311 in each light source module 310 can be arranged along the first direction or the second direction, and the embodiments of the present application do not limit the arrangement manner of each light emitting element 311.

[0203] It should be further noted that the light path adjustment module 320 described above can include a light-transmitting element or a light-reflecting element. If the light 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.

[0204] 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.

[0205] In summary, the backlight module provided in the embodiments of the present application includes at least one light source module and a light 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 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 that emits 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 of the eye point to emit light according to the observation area of the eye point, so as to irradiate the observation area. The eye point is the position of the user observing the deflected light through the eyes. The scheme provided in the embodiments of the present application can make the initial light emitted by each light-emitting element adjust the propagation angle of the initial light 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. Therefore, 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.

[0206] 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 of the image in the user's eyes can be improved.

[0207] 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.

[0208] In addition, in the head-up display system, the current parameters required by each light emitting element when emitting light are calculated by the processor, the light emitting brightness of the light emitting element can be adjusted by the size of the current parameter, so that the adaptability and flexibility of the head-up display system in different scenes of the vehicle can be improved.

[0209] The following describes in detail the process of directing light emission of the head-up display system by the processor as the execution subject.

[0210] Figure 18 The method flowchart of the display method provided by the embodiment of the application is described by way of example but not limitation, and see Figure 18 The method comprises the following steps.

[0211] S1, receiving position information sent by the driver monitoring system.

[0212] The position information is used to indicate the observation area where the eye point is located, and the eye point is the position where the user observes the deflected light through the eyes.

[0213] S2, determining the light emitting element corresponding to the observation area according to the position information.

[0214] S3, generating and sending a light emitting instruction to the image generating unit according to the light emitting element corresponding to the observation area.

[0215] The light emitting instruction is used to instruct the light emitting element corresponding to the observation area in the image generating unit to emit the initial light, and the deflected light is obtained after the light path adjustment of the initial light.

[0216] S2 can comprise the following steps.

[0217] According to the position information, the illumination area matched with the observation area is determined.

[0218] According to the illumination area, the light emitting element corresponding to the illumination area is determined.

[0219] Moreover, S3 can comprise the following steps.

[0220] According to the position of the observation area, the current parameter of the light emitting element when emitting light is calculated, and the current parameter is used to indicate the brightness of the light emitting element when emitting light.

[0221] According to the light emitting element corresponding to the observation area and the current parameter of the light emitting element when emitting light, the light emitting instruction is generated.

[0222] It should be noted that the process of displaying the image described in the display method is similar to the process of controlling at least one light emitting element in the image generating unit to emit light by the processor in the head-up display system according to the plurality of data shown in Figure 2 Therefore, details are not repeated here.

[0223] To sum up, the display method provided in the embodiments of the present application receives the position information sent by the driver monitoring system, the position information is used to indicate the observation area where the eye point is located, the eye point is the position where the user observes the deflected light through the eyes, and the corresponding light emitting element of the observation area is determined according to the position information. Then, the light emitting instruction is generated according to the corresponding light emitting element of the observation area and is sent to the image generation unit. The light emitting instruction is used to instruct the light emitting element corresponding to the observation area in the image generation unit to emit the initial light. The initial light is deflected after the light path adjustment. The scheme provided in the embodiments of the present application selects different light emitting elements to emit light at different moments according to different eye points of the user, which 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 screen adjacent to the backlight module to prevent screen burn-in.

[0224] It should be understood that the size of the serial number of each step in the above embodiments 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 embodiments of the present application.

[0225] In the above embodiments, the description of each embodiment has its own emphasis. The parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0226] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Professionals 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.

[0227] In the embodiments provided in the present application, it should be understood that the disclosed devices / apparatuses and methods can be implemented in other ways. For example, the device / apparatus embodiments described above are only schematic. For example, the division of the modules or units is only 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 interfaces, devices or units, and can be electrical, mechanical or other forms.

[0228] It should be understood that the term "includes" when used in the specification and the appended claims herein, specifies the presence of stated features, integers, steps, operations, elements, and / or components but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0229] It should also be understood that the term "and / or" when used in the specification and the appended claims herein, means any one or more of the associated listed items and includes possibilities where additional items in the list are present in addition to those specifically mentioned.

[0230] As used in the specification and the appended claims herein, the term "if' can be construed to mean "when" or "upon" or "in response to determining" 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 construed to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0231] In addition, the terms "first", "second", "third", etc. as used in the description of the specification and the appended claims herein are merely used for distinguishing between similar underlying features, and do not constitute limitations on the scope of the claims by the use of such terms.

[0232] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", and so on, in various places throughout this specification are not necessarily all referring to the same embodiment, unless otherwise specified. The terms "comprise", "comprising", "has", "having", "includes" and "including" as well as variations thereof, mean "including but not limited to", unless expressly specified otherwise.

[0233] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating the technical solutions of the present application, but are not intended to limit the technical solutions of the present application; even though the technical solutions of the present application have been described in detail with reference to the above-described embodiments, those skilled in the art should understand that they can still make modifications to the technical solutions described in the above-described embodiments, or make equivalent replacements to some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, characterized in that, The backlight module comprises at least one light source module and a light path adjusting module; Each of the light source modules comprises at least one light emitting element; The light source module emits initial light rays through the at least one light emitting element, and the light path adjusting module is located on a propagation path of the initial light rays and is used for adjusting a propagation angle of the initial light rays to obtain deflected light rays, wherein an irradiation area irradiated by the deflected light rays corresponds to the light emitting element emitting the initial light rays, and the irradiation area corresponding to each of the light emitting elements is different. The backlight module is used for controlling the light emitting element corresponding to the irradiation area matched with an observation area where an eye point is located to emit light according to the observation area, so as to irradiate the observation area, and the deflected light rays irradiate the observation area, wherein the eye point is a position where a user observes the deflected light rays through eyes.

2. The backlight module of claim 1, wherein, The light path adjusting module comprises a collimating lens, a microlens array and a light path deflection unit; The collimating lens is located on the propagation path of the initial light rays and is used for adjusting the propagation angle of the initial light rays to form collimated light rays; The microlens array is located on the propagation path of the collimated light rays and is used for diverging the collimated light rays to obtain divergent light rays; The light path deflection unit is located on the propagation path of the divergent light rays and is used for converging the divergent light rays to form the deflected light rays.

3. The backlight module of claim 2, wherein, The light path deflection unit comprises a first light path deflection subunit and / or a second light path deflection subunit; The first light path deflection subunit is located on the propagation path of the divergent light rays and is used for adjusting the propagation angle of the divergent light rays to form deflected light rays; The second light path deflection subunit is located on the propagation path of the deflected light rays and is used for adjusting the propagation angle of the deflected light rays to form the deflected light rays.

4. The backlight module of claim 3, wherein, The first light path deflection subunit and the second light path deflection subunit are light-transmitting elements or light-reflecting elements; If the first light path deflection subunit is the light-reflecting element, the second light path deflection subunit is the light-reflecting element.

5. The backlight module of claim 4, wherein, The light-transmitting element is a lens or a holographic optical element, and the light-reflecting element is a mirror or a reflective holographic optical element.

6. The backlight module of claim 4, wherein, If the first light path deflection subunit is a first mirror, the second light path deflection subunit comprises a second mirror and a reflective holographic optical element; The second mirror and the reflective holographic optical element are arranged in abutment, and the reflective holographic optical element is located between the first mirror and the second mirror.

7. The backlight module of claim 1, wherein, The at least one light source module comprises a plurality of light source modules, and each of the light source modules comprises a plurality of light emitting elements; The light path adjusting module comprises a light-transmitting element array, and the light-transmitting element array comprises a plurality of light-transmitting elements; Each of the light-transmitting elements corresponds to a plurality of light emitting elements; For each of the light-transmitting elements, the light-transmitting element is located on a light path of initial light rays emitted by the corresponding plurality of light emitting elements and is used for adjusting a propagation angle of the initial light rays to obtain the deflected light rays.

8. The backlight module of claim 7, wherein, Each of the light emitting elements in each of the light source modules periodically emits the initial light rays in turn.

9. The backlight module of claim 8, wherein, Each of the light source modules simultaneously emits a plurality of initial light rays to the same illumination area via the light emitting elements.

10. The backlight module of claim 7, wherein, The number of the light emitting elements in each of the light source modules is consistent with the number of the observation areas.

11. The backlight module of claim 1, wherein, The at least one light source module comprises a plurality of light source modules, each of which comprises at least one light emitting element. The light path adjustment module comprises an array of reflective elements, which comprises a plurality of reflective elements. The plurality of light source modules correspond to the plurality of reflective elements one by one. For each of the light source modules, the initial light rays emitted by the light source module are reflected by the corresponding reflective element to obtain the deflected light rays.

12. The backlight module of claim 11, wherein, The plurality of reflective elements are distributed around the plurality of light source modules in a rotationally symmetric manner.

13. The backlight module of claim 11, wherein, The number of the reflective elements in the reflective array is consistent with the number of the observation areas.

14. The backlight module of claim 11, wherein, The reflective elements are curved mirrors or reflective cups.

15. The backlight module of claim 14, wherein, The curved mirrors are concave mirrors or convex mirrors.

16. 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.

17. The backlight module of claim 16, 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.

18. The backlight module of claim 17, wherein, If the light source module comprises a plurality of light emitting elements, the plurality of light emitting elements in each of the light source modules are arranged along the first direction or the second direction.

19. The backlight module of any of claims 1 to 18, wherein, If the light path adjustment module comprises at least one lens, the lens is a cylindrical lens or a Fresnel lens.

20. The backlight module of any of claims 1 to 18, wherein, The light emitting elements are light emitting diodes or micro light emitting diodes.

21. An image generation unit, characterized by comprising: The image generation unit comprises a liquid crystal display screen and a backlight module as claimed in any one of claims 1 to 20. The backlight module is used to generate initial light rays. The liquid crystal display screen is located on the propagation path of the initial light rays and is used to display images according to the initial light rays.

22. The image generation unit of claim 21, wherein, If the plurality of light-transmitting elements comprised by the light path adjustment module are holographic optical elements, the plurality of light-transmitting elements are arranged in close contact with the liquid crystal display screen.

23. The image generation unit of claim 21 or 22, wherein, The image generation unit further comprises a light splitting device. The light splitting device is located on the side of the liquid crystal display screen away from the backlight module. The light splitting device is used to split the initial light rays displayed by the liquid crystal display screen to obtain a plurality of groups of split light rays, so as to achieve a three-dimensional display effect through the plurality of groups of split light rays.

24. A heads-up display system, characterized by The head-up display system comprises a processor, a driver monitoring system, a plurality of mirrors, and an image generation unit as claimed in any one of claims 21 to 23. The driver monitoring system is used to determine an observation area in which an eye point is located, the eye point being the position at which a user observes the deflected light rays through the eyes. The processor is used to determine an illumination area matched with the observation area in which the eye point is located. The processor is further used to determine a light emitting element corresponding to the illumination area. The processor is further used to send a light emitting instruction to the image generation unit, the light emitting instruction being used to instruct the light emitting element corresponding to the observation area in the image generation unit to emit initial light rays. The image generation unit is configured to control the light emitting element corresponding to the observation area to emit the initial light according to the light emitting instruction.

25. The head-up display system of claim 24, wherein, The driver monitoring system comprises an eye movement tracking device configured to determine the observation area corresponding to the eye point of the user.

26. The head-up display system of claim 24 or 25, wherein, The processor is further configured to determine the current parameter of the light emitting element corresponding to the observation area where the eye point is located when the light emitting element emits light, the current parameter being used to represent the brightness of the light emitting element when the light emitting element emits light.

27. A display method characterized by comprising: The display method applied to the head-up display system as claimed in any one of claims 24 to 26, the display method comprising: receiving position information sent by the driver monitoring system, the position information being used to represent the observation area where the eye point is located, the eye point being the position where the user observes the deflected light through the eyes; determining the light emitting element corresponding to the observation area according to the position information; generating and sending a light emitting instruction to the image generation unit according to the light emitting element corresponding to the observation area, the light emitting instruction being used to instruct the light emitting element corresponding to the observation area in the image generation unit to emit the initial light, the initial light being adjusted by the optical path to obtain the deflected light.

28. The display method according to claim 27, wherein The determination of the light emitting element corresponding to the observation area according to the position information comprises: determining the irradiation area matched with the observation area according to the position information; determining the light emitting element corresponding to the irradiation area according to the irradiation area.

29. The display method according to claim 27, wherein The generation of the light emitting instruction according to the light emitting element corresponding to the observation area comprises: calculating the current parameter of the light emitting element when the light emitting element emits light according to the position where the observation area is located, the current parameter being used to represent the brightness of the light emitting element when the light emitting element emits light; generating the light emitting instruction according to the light emitting element corresponding to the observation area and the current parameter of the light emitting element when the light emitting element emits light.

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