Backlight module, head-up display device and transportation tool

Abstract

A backlight module, a head-up display device and a vehicle are provided. The backlight module comprises: a plurality of light source components configured to provide collimated light; and a direction control component, the direction control component being located at the light-emitting side of at least one of the plurality of light source components, the direction control component comprising a diffusion element and a convergence element; the collimated light is diffused by the diffusion element to increase the light-emitting area, and is converged by the convergence element to adjust the direction of the emitted light, so that the head-up display device comprising the backlight module forms a larger eye box area.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] For all purposes, this patent application claims priority to Chinese Patent Application No. 202111162367.X filed on September 30, 2021, and the contents of the above-mentioned Chinese patent application are hereby cited in their entirety as a part of this application. Technical Field

[0003] Embodiments of the present disclosure relate to a backlight module, a head-up display device, and a vehicle. Background Art

[0004] The head up display (HUD) uses a reflective optical design to project light from an image source onto an imaging window (e.g., an imaging board, a windshield, etc.). The driver can see the image directly without lowering his head, thus avoiding distraction caused by looking down at the dashboard while driving, improving driving safety, and providing a better driving experience. Summary of the invention

[0005] Embodiments of the present disclosure provide a backlight module, a head-up display device, and a vehicle.

[0006] An embodiment of the present disclosure provides a backlight module, comprising: a plurality of light source assemblies configured to provide collimated light; and a direction control assembly, wherein the direction control assembly is located on the light emitting side of at least one of the plurality of light source assemblies, and the direction control assembly comprises a diffusion element and a convergence element; the collimated light is diffused by the diffusion element to increase the light emitting area, and is converged by the convergence element to adjust the direction of the emitted light.

[0007] For example, the diffusion of the diffusion element includes at least one of diffusion in a first direction and diffusion in a second direction, and the first direction intersects with the second direction.

[0008] For example, the backlight module further includes at least one lamp tube, which includes a shell and an inner cavity at least surrounded by the shell, and the multiple light source components and at least part of the direction control components are located in the inner cavity of the at least one lamp tube.

[0009] For example, the lamp tube has a light outlet, the light outlet includes a long side and a short side, the length of the long side is greater than the length of the short side, the long side of the light outlet extends along a first direction, and the short side of the light outlet extends along a second direction.

[0010] For example, after the direction of the collimated light is controlled by the direction control component, it at least covers the light outlet.

[0011] For example, a reflective surface is provided on the inner wall of the housing to adjust the direction of the light irradiated on the reflective surface so as to emit toward the light outlet.

[0012] For example, the lamp tube is parabolic.

[0013] For example, the diffusion element includes a one-dimensional diffusion element, and the convergence element includes a one-dimensional convergence lens and / or a two-dimensional convergence lens.

[0014] For example, the one-dimensional diffusion element includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens; the one-dimensional convergence element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens; the two-dimensional convergence lens includes at least one of a convex lens and a circular Fresnel lens.

[0015] For example, the diffusion element performs a first diffusion and then a second diffusion on the light corresponding to the collimated light, the first diffusion being one of diffusion in a first direction and diffusion in a second direction, and the second diffusion being the other of diffusion in the first direction and diffusion in the second direction.

[0016] For example, the convergence of the convergence element includes a first convergence and a second convergence, wherein the first convergence is to converge the light after the first diffusion and before the second diffusion, and the second convergence is to converge the light after the second diffusion.

[0017] For example, the light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and the second diffusion processing, or the light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and before being subjected to the second diffusion.

[0018] For example, the diffusion element includes a diffusion film and at least one of a plano-concave cylindrical mirror and a linear concave Fresnel lens, the converging element includes at least one of a plano-convex cylindrical mirror and a linear convex Fresnel lens, and the diffusion film, at least one of the plano-concave cylindrical mirror and the linear concave Fresnel lens, and at least one of the plano-convex cylindrical mirror and the linear convex Fresnel lens are arranged along the light emitting direction of the light emitted by the light source assembly.

[0019] For example, the diffusion film is configured to diffuse the collimated light in a first direction, at least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens is configured to diffuse the light passing through the diffusion film in a second direction, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens is configured to converge the light passing through the plano-concave cylindrical mirror in the second direction.

[0020] For example, the diffusion element includes a first sub-diffuser and a second sub-diffuser, the converging element includes a first sub-converging element and a second sub-converging element, and the first sub-diffuser, the second sub-diffuser, the first sub-converging element, and the second sub-converging element are arranged along the light emitting direction of the light emitted by the light source assembly; or the diffusion element includes a first sub-diffuser and a second sub-diffuser, the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, and the first sub-diffuser, the second sub-diffuser, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly.

[0021] For example, when the first sub-diffuser, the second sub-diffuser, the first sub-converging member, and the second sub-converging member are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser is configured to diffuse the light incident thereon in the second direction, the first sub-converging member is configured to converge the light passing through the first sub-diffuser in the second direction, the second sub-diffuser is configured to diffuse the light passing through the first sub-converging member in the first direction, and the second sub-converging member is configured to converge the light passing through the second sub-diffuser in the first direction; when the first sub-diffuser, the second sub-diffuser, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser is configured to diffuse the collimated light in the second direction, the second sub-diffuser is configured to diffuse the light passing through the first sub-diffuser in the first direction, and the plano-convex cylindrical mirror is configured to converge the light passing through the second sub-diffuser in the first direction and the second direction.

[0022] For example, the first sub-diffuser includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens; the second sub-diffuser includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens; the first sub-convergent element includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens; and the second sub-convergent element includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.

[0023] For example, the direction control element further includes a deflection diffusion film, which is arranged in the light emitting direction of the converging element, and is configured to deflect and diffuse the light passing through the converging element for emission.

[0024] For example, the light source assembly includes a light source and a collimating lamp cup, the light source is configured to emit light, and the collimating lamp cup is configured to collimate at least a portion of the light emitted by the light source.

[0025] For example, the light source component includes a polarization splitter element and a polarization conversion element. The polarization splitter element is configured to split the light irradiated thereon into a first polarized light and a second polarized light with different propagation directions and different polarization states. The polarization conversion element is configured to convert the light corresponding to the second polarized light into a third polarized light, and the third polarized light has the same polarization state as the first polarized light.

[0026] For example, the backlight module further includes a reflective element, and the reflective element is configured to reflect light corresponding to the first polarized light or light corresponding to the second polarized light.

[0027] For example, the polarization conversion element is located on a side of the polarization splitting element away from the light source, on a side of the reflective element away from the light source, or between the polarization splitting element and the reflective element.

[0028] For example, the backlight module further includes a sensor, which is configured to detect external light incident thereon and send out a signal.

[0029] For example, the multiple light source assemblies include multiple first light source assemblies and multiple second light source assemblies, the multiple first light source assemblies and the multiple second light source assemblies are arranged axially symmetrically with respect to the symmetry axis, and are respectively located on both sides of the symmetry axis, and the sensor is located between the multiple first light source assemblies and the multiple second light source assemblies.

[0030] For example, the orthographic projection of the light source assembly on the plane where the sensor is located at least partially overlaps with the sensor, and the at least overlapping portion can transmit external light.

[0031] For example, the backlight module further includes at least one light evening element, and the at least one light evening element is disposed on a side of the direction control element away from the light source assembly.

[0032] An embodiment of the present disclosure further provides a head-up display device, comprising a display panel and any of the above-mentioned backlight modules.

[0033] For example, the same eye box area of ​​the head-up display device is configured to allow users in a driving position and a passenger seat to view a virtual image of the head-up display device.

[0034] An embodiment of the present disclosure further provides a head-up display device, comprising a display panel and any one of the above-mentioned backlight modules, wherein the display panel is located at the light outlet of the lamp tube.

[0035] For example, the head-up display device further includes a transflective element, and the long side of the light outlet is configured to correspond to the left and right directions of the transflective element.

[0036] An embodiment of the present disclosure further provides a vehicle, comprising any of the above-mentioned backlight modules or any of the above-mentioned head-up display devices.

[0037] For example, the transflective element is a windshield of the vehicle, and the long side of the light outlet is configured to correspond to the left and right directions of the windshield. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0039] Figure 1A A schematic diagram of a backlight module provided for some embodiments of the present disclosure.

[0040] Figure 1B for Figure 1A A schematic diagram of a light source assembly in a backlight module is shown.

[0041] Figure 1C to Figure 1F A schematic diagram of another arrangement of light source components in a backlight module provided for some embodiments of the present disclosure.

[0042] FIG. 2A to FIG. 2C A schematic diagram of a collimated light source in a light source assembly in a backlight module provided for some embodiments of the present disclosure.

[0043] FIG. 3A to FIG. 5B A schematic diagram of a direction control component in a backlight module provided for some embodiments of the present disclosure.

[0044] Fig. 6A A schematic diagram of another backlight module provided for some embodiments of the present disclosure.

[0045] Figure 6B A schematic diagram of another backlight module provided for some embodiments of the present disclosure.

[0046] Figure 7 A schematic diagram of a lamp tube in a backlight module provided for some embodiments of the present disclosure.

[0047] FIG. 8A to FIG. 8D A schematic diagram of a head-up display device provided for some embodiments of the present disclosure.

[0048] Fig. 9 A schematic diagram of the optical path of a HUD device included in a vehicle. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0050] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] "At least one" means one or more; "plurality" means at least two.

[0052] In the technologies known to the inventors, the eye box area of ​​the HUD is relatively small, which is difficult to meet the practical needs of users.

[0053] Figure 1A A schematic diagram of a backlight module provided for some embodiments of the present disclosure. Figure 1B for Figure 1A A schematic diagram of a light source assembly in a backlight module is shown. Figure 1C A schematic diagram of another arrangement of light source components in a backlight module provided for some embodiments of the present disclosure. FIG. 2A to FIG. 2C A schematic diagram of a collimated light source in a light source assembly in a backlight module provided for some embodiments of the present disclosure. FIG. 3A to FIG. 5B A schematic diagram of a direction control component in a backlight module provided for some embodiments of the present disclosure. Fig. 6A A schematic diagram of another backlight module provided for some embodiments of the present disclosure. Figure 6B A schematic diagram of another backlight module provided for some embodiments of the present disclosure. Figure 7 A schematic diagram of a lamp tube in a backlight module provided for some embodiments of the present disclosure. FIG. 8A to FIG. 8DA schematic diagram of a head-up display device provided in some embodiments of the present disclosure. FIG. 1A to FIG. 8D Provide explanation.

[0054] like Figure 1A , FIG. 3A to FIG. 5B As shown, some embodiments of the present disclosure provide a backlight module 100, comprising: a plurality of light source components 11 and a direction control component 12. The plurality of light source components 11 are configured to provide collimated light. Figure 1A The direction control component 12 is not shown. FIG. 3A to FIG. 5B The direction control component 12 is provided to improve the uniformity of the backlight and the uniformity of the display image. The direction control component 12 can reduce the number of light sources provided, reduce the cost, and reduce heat generation.

[0055] For example, collimated light refers to parallel or nearly parallel light, and the divergence angle of collimated light is smaller, which is more conducive to control.

[0056] For example, the direction control element 12 may include at least one of a lens, a diffusion film, and a deflection diffusion film.

[0057] like FIG. 3A to FIG. 5B As shown, the direction control component 12 is located on the light emitting side of at least one light source component 11 among the plurality of light source components 11. Figure 1A , FIG. 3A to FIG. 5B The propagation of light is shown in FIG. The upper side of the light source assembly 11 is its light emitting side.

[0058] like FIG. 3A to FIG. 5B As shown, the direction control assembly 12 includes a diffusion element 121 and a convergence element 122. FIG. 3A to FIG. 5B As shown, the collimated light is diffused by the diffusion element 121 to increase the light exiting area, and is converged by the convergence element 122 to adjust the direction of the exiting light.

[0059] For example, the light exit area refers to the area of ​​the emitted light. For example, after the collimated light is diffused by the diffusion element, the light exit area increases. For example, after the collimated light is diffused by the converging element, the light exit area decreases.

[0060] For example, the diffusion element 121 is provided to expand the light-emitting surface, and the main optical axis of the light passing through the diffusion element 121 does not change.

[0061] For example, the converging element 122 is provided to adjust the light emission direction. For example, the main optical axis of the light converged by the converging element 122 may change, and the main optical axis can be adjusted by adjusting the surface shape of the converging element.

[0062] The backlight module 100 provided in some embodiments of the present disclosure can control light so that the head-up display device including the backlight module has a larger eye box area, so that passengers other than the driver (such as the front passenger) can view the virtual image of the head-up display device. For example, the head-up display device can have an eye box area for the driver and the front passenger to view the virtual image.

[0063] For example, the direction of the light being controlled by the direction control component 12 includes first diffusing the light and then converging the light.

[0064] The backlight module 100 provided in some embodiments of the present disclosure controls light to form an imaging area for the driver and passengers to view. The backlight module 100 provided in some embodiments of the present disclosure can form a larger imaging area, allowing passengers other than the driver (such as the front passenger) to view the image.

[0065] like Figure 1A As shown, in the backlight module 100 provided in some embodiments of the present disclosure, at least two light source assemblies 11 among the plurality of light source assemblies 11 are arranged in the first direction X.

[0066] For example, Figures 1A to 6B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the light source assembly 11 includes a light source 11a, a collimating lamp cup 11b, a polarization splitter element 11c, and a polarization conversion element 11d. The light source 11a is configured to emit light, and the collimating lamp cup 11b is configured to collimate at least part of the light emitted by the light source 11a.

[0067] For example, the light source assembly 11 further includes a polarization splitter element 11c and a polarization conversion element 11d. The polarization splitter element 11c is configured to convert the light incident thereon into two beams of light with different propagation directions and different polarization states, and the polarization conversion element 11d is configured to convert the polarization state of the light incident thereon.

[0068] For example, the light source assembly 11 further includes a reflective element 11 e , and the reflective element 11 e is configured to adjust the propagation direction of the light irradiated thereon, thereby achieving a light recycling effect and improving light utilization efficiency.

[0069] For example, the light source assembly includes a polarization splitter element 11c and a polarization conversion element 11d. The polarization splitter element 11c is configured to split the light incident thereon into a first polarized light and a second polarized light with different propagation directions and polarization states. The polarization conversion element 11d is configured to convert the light corresponding to the second polarized light into a third polarized light, and the third polarized light has the same polarization state as the first polarized light.

[0070] For example, the backlight module further includes a reflective element 11 e , and the reflective element 11 e is configured to reflect light corresponding to the first polarized light or light corresponding to the second polarized light.

[0071] For example, the polarization conversion element is located on a side of the polarization splitting element far from the light source, on a side of the reflection element far from the light source, or between the polarization splitting element and the reflection element.

[0072] For example, Figures 1A to 1C As shown, the polarization splitter element 11c is configured to receive the collimated light collimated by the collimating lamp cup 11b and reflect the first polarized light and transmit the second polarized light, the polarization conversion element 11d is configured to receive the second polarized light transmitted through the polarization splitter element 11c and convert it into a third polarized light, the polarization state of the first polarized light is different from the polarization state of the second polarized light, and the polarization state of the third polarized light is the same as the polarization state of the first polarized light.

[0073] For example, the light with a certain divergence angle emitted by the light source 11a is converted into collimated light after passing through the collimating lamp cup 11b; the collimated light is adjusted in its propagation direction by the direction control element 12, and the light after direction adjustment is adjusted for a second time by the lamp tube 10, and finally emitted to the display panel 200 and converted into image light.

[0074] Because the light emitted by the light source 11a has a certain divergence angle, light with a larger divergence angle (for example, light with a divergence angle greater than 30 degrees, 45 degrees, 60 degrees or 70 degrees) is difficult to reach the polarization splitter element and is therefore difficult to be used for imaging. Therefore, a collimating lamp cup can be provided to collimate at least part of the light emitted by the light source 11a to obtain collimated light.

[0075] In this disclosure Figure 1A , FIG. 3A to FIG. 5B In the embodiment shown, the first polarized light is an S polarized light, the second polarized light is a P polarized light, and the third polarized light is an S polarized light. Of course, in other embodiments, the first polarized light and the third polarized light can be P polarized light, and the second polarized light can be S polarized light.

[0076] It can be explained that the structure of the light source assembly 11 is not limited to the above description, and other structures of the light source assembly 11 can also be used. For example, the collimated light source assembly 11 that provides collimated light can be replaced by a laser, but it is not limited thereto.

[0077] like Figure 1AAs shown, a plurality of collimating lamp cups 11b are arranged in the lamp tube 10. For example, the collimating lamp cup 11b includes at least one of a total reflector lamp cup and a parabolic reflector lamp cup. For example, a collimating lens may be further added to the parabolic reflector lamp cup to improve the collimation effect. Figure 2A , Figure 2B and Figure 2C The collimating lamp cup 11b in the backlight module 100 provided in some embodiments of the present disclosure may be as follows: FIG. 2A to FIG. 2C The structure shown is, but not limited to, a suitable collimating lamp cup 11b can be selected according to needs.

[0078] For example, Figures 1A to 6B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, in order to improve utilization, the backlight module 100 also includes a reflective element 11e, and the reflective element 11e is configured to receive the first polarized light reflected by the polarization splitting element 11c and adjust its propagation direction so that its propagation direction is the same as the propagation direction of the third polarized light.

[0079] The purpose of providing the reflective element 11e is to convert the light without polarization characteristics into the light with the same polarization state. The light with the same polarization state can be reflected by the display panel 200 (such as Fig. 8A and Figure 8B For example, the display panel 200 includes a liquid crystal screen.

[0080] For example, the reflective element 11e may include at least one of a polarization transflective element, a reflective element, or a polarization conversion element. Figure 1B and Figure 1C to Figure 1F In the embodiment shown, the polarization conversion element 11d can be a 1 / 2 wave plate. Depending on the position of the polarization conversion element, the properties of the polarization transflective element will also vary.

[0081] For example, Figures 1D to 1F The light source assembly 11 shown is Figure 1B and Figure 1C Compared with the light source assembly 11 shown in FIG. 1 , the position of the polarization conversion element 11 d is adjusted.

[0082] like Figure 1D As shown, the polarization conversion element 11d may be located above the reflective element 11e to convert the polarization state of the light recovered by the reflective element 11e.

[0083] like Figure 1E As shown, the polarization conversion element 11d can be located between the polarization splitting element 11c and the reflection element 11e to convert the polarization state of one of the light beams split by the polarization splitting element 11c.

[0084] like Figure 1FThe light source assembly 11 shown is similar to Figure 1E Compared with the light source assembly 11 shown in FIG. 1 , the setting direction of the polarization conversion element 11d is adjusted, such as Figure 1F The polarization conversion element 11d shown in the figure can be rotated in the plane where it is located to obtain the following Figure 1E The polarization conversion element 11d is shown.

[0085] The efficiency of recycling collimated light through the reflective element 11e is relatively high, therefore, a lamp cup with a collimating effect is used and a reflective element 11e is provided to improve the light utilization rate. Figure 1B and Figure 1C As shown, the light emitted by the light source 11a is converted into collimated light after passing through the collimating lamp cup 11b. The collimated light is incident on the polarization transflective element 11b, and the polarization transflective element 11b reflects the S polarization state light and transmits the P polarization state light as an example for explanation. The reflected S polarization state light is then reflected by the reflective element 11e and then emitted, and the transmitted P polarization state light is converted into S polarization state light after passing through the polarization conversion element 11d.

[0086] like FIG. 3A to FIG. 5B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the diffusion of the collimated light by the diffusion element 121 includes at least one of diffusion in the first direction X and diffusion in the second direction Y, and the first direction X intersects (e.g., is perpendicular to) the second direction Y. It should be noted that in the embodiments of the present disclosure, the light can be diffused only in the first direction X, diffused only in the second direction Y, or diffused in both the first direction X and the second direction Y. In the case where the diffusion of the diffusion element 121 includes diffusion in the first direction X and diffusion in the second direction Y, there is no limitation on whether the diffusion in the first direction X or the second direction Y is performed first.

[0087] For example, the diffusion process of the collimated light by the diffusion element 121 includes at least one of diffusion in the first direction X and diffusion in the second direction Y.

[0088] like Figure 1A As shown, in some embodiments of the present disclosure, the backlight module 100 further includes at least one lamp tube 10, the lamp tube 10 includes a shell 10a and an inner cavity 10b at least surrounded by the shell 10a, and a plurality of light source components 11 and at least part of the direction control components 12 are located in the inner cavity 10b of the at least one lamp tube. Figure 1A , FIG. 3A to FIG. 5B The direction control component 12 is located above the light source component 11, and the direction control component 12 is located in the inner cavity 10b. For example, the direction control component 12 may include at least one of a lens, a diffusion film, and a deflection diffusion film.

[0089] For example, the backlight module 100 may include one or more lamp barrels 10. In some embodiments, the backlight module 100 may include two or more lamp barrels 10. The number of lamp barrels 10 is determined according to needs.

[0090] For example, multiple lamp barrels may correspond to one direction control element. For example, multiple lamp barrels may correspond to one deflection diffuser.

[0091] For example, one direction control element may be provided corresponding to one lamp tube 10 , so that when a plurality of lamp tubes are provided, the backlight module includes a plurality of direction control elements.

[0092] For example, Figure 1A As shown, the lamp tube 10 is an inverted roof-shaped lamp tube. The lamp tube 10 is narrow at the bottom and wide at the top, so as to form a larger image.

[0093] like Figure 1A As shown, the lamp tube 10 has a light outlet 1002, and the light outlet 1002 includes a long side 1002a and a short side 1002b. The length of the long side 1002a is greater than the length of the short side 1002b. For example, the first direction X is the extension direction of the long side 1002a of the light outlet 1002, and the second direction Y is the extension direction of the short side 1002b of the light outlet 1002. For example, the long side 1002a of the light outlet 1002 extends along the first direction X, and the short side 1002b of the light outlet 1002 extends along the second direction Y.

[0094] like Figure 1A As shown, the lamp tube 10 includes a bottom surface 1001, which is opposite to the light outlet 1002, and includes a long side 1001a and a short side 1001b. The first direction X can also be the extension direction of the long side 1001a of the bottom surface 1001, and the second direction Y can also be the extension direction of the short side 1001b of the bottom surface 1001.

[0095] Of course, in other embodiments, the first direction X and the second direction Y may also be given as references based on other elements.

[0096] Figure 1A A third direction Z is also shown, and the third direction Z is perpendicular to the first direction X and the second direction Y. That is, the third direction Z is perpendicular to the plane where the first direction X and the second direction Y are located. For example, the third direction Z is a direction perpendicular to the bottom surface 1001 .

[0097] The embodiments of the present disclosure are described by taking the example that every two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0098] In the backlight module 100 provided in some embodiments of the present disclosure, the light whose direction is controlled by the direction control element at least covers the light outlet 1002 .

[0099] For example, the light at least covers the light outlet 1002, which means that light is emitted from all parts of the light outlet 1002, and the existence of light that does not pass through the light outlet is not excluded.

[0100] In the backlight module 100 provided in some embodiments of the present disclosure, the diffusion element 121 includes a one-dimensional diffusion element, and the converging element 122 includes a one-dimensional converging lens or a two-dimensional converging lens. In the backlight module 100 provided in some embodiments of the present disclosure, the one-dimensional diffusion element includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens, the one-dimensional converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, and the two-dimensional converging lens includes at least one of a convex lens and a circular Fresnel lens.

[0101] For example, in some embodiments, the diffusion element 121 includes only a diffusion film without a concave lens. In other embodiments, the diffusion element 121 includes only a diffusion film without a concave lens. In other embodiments, the diffusion element 121 may include a diffusion film and a concave lens.

[0102] For example, the plano-concave cylindrical mirror in the embodiment of the present disclosure can be replaced by a linear Fresnel concave lens, the plano-convex cylindrical mirror in the embodiment of the present disclosure can be replaced by a linear Fresnel convex lens, and the convex lens in the embodiment of the present disclosure can be replaced by a circular Fresnel lens.

[0103] For example, the diffusion element includes a diffusion film and includes at least one of a plano-concave cylindrical mirror and a linear concave Fresnel lens, and the converging element includes at least one of a plano-convex cylindrical mirror and a linear convex Fresnel lens. For example, the diffusion film, at least one of the plano-concave cylindrical mirror and the linear concave Fresnel lens, and at least one of the plano-convex cylindrical mirror and the linear convex Fresnel lens are arranged along the light emitting direction of the light emitted by the light source assembly.

[0104] For example, the diffusion film is configured to diffuse the collimated light in a first direction, at least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens is configured to diffuse the light passing through the diffusion film in a second direction, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens is configured to converge the light passing through the plano-concave cylindrical mirror in the second direction.

[0105] For example, in some embodiments, the diffusion element includes a first sub-diffuser F1 and a second sub-diffuser F2, the converging element includes a first sub-converging member C1 and a second sub-converging member C2, and the first sub-diffuser F1, the second sub-diffuser F2, the first sub-converging member C1, and the second sub-converging member C2 are arranged along the light emitting direction of the light emitted by the light source assembly 11.

[0106] For example, Figure 3A As shown, the diffusion element includes a first sub-diffuser F1 and a second sub-diffuser F2, the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, and the first sub-diffuser F1, the second sub-diffuser F2, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly.

[0107] For example, in some embodiments, when the first sub-diffuser F1, the second sub-diffuser F2, the first sub-converging member C1, and the second sub-converging member C2 are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser F1 is configured to diffuse the light incident thereon in the second direction, the first sub-converging member C1 is configured to converge the light passing through the first sub-diffuser F1 in the second direction, the second sub-diffuser F2 is configured to diffuse the light passing through the first sub-converging member C1 in the first direction, and the second sub-converging member C2 is configured to converge the light passing through the second sub-diffuser F2 in the first direction.

[0108] For example, when the first sub-diffuser F1, the second sub-diffuser F2, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser F1 is configured to diffuse the collimated light in the second direction, the second sub-diffuser F2 is configured to diffuse the light passing through the first sub-diffuser F1 in the first direction, and the plano-convex cylindrical mirror is configured to converge the light passing through the second sub-diffuser F2 in the first direction and the second direction.

[0109] For example, the first sub-diffuser F1 includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens; the second sub-diffuser F2 includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens; the first sub-convergent element C1 includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens; and the second sub-convergent element C2 includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.

[0110] For example, Figure 4AAs shown, the diffusion element includes a first sub-diffuser F1 and a second sub-diffuser F2, the converging element includes a first sub-converging element C1 and a second sub-converging element C2, and the first sub-diffuser F1, the first sub-converging element C1, the second sub-diffuser F2, and the second sub-converging element C2 are arranged along the light emitting direction of the light emitted by the light source assembly 11.

[0111] For example, the quantitative relationship between the first sub-diffuser and the second sub-diffuser may be that the orthographic projections of the plurality of first sub-diffusers on the XY plane correspond to the orthographic projections of the plurality of second sub-diffusers on the XY plane, or one first sub-diffuser may correspond to the plurality of second sub-diffusers, or one first sub-diffuser may correspond to one second sub-diffuser. For example, when the first sub-diffuser is a diffusion film and the second sub-diffuser is a plano-concave cylindrical mirror or a one-dimensional Fresnel concave lens, the plurality of diffusion films may correspond to the plurality of plano-concave cylindrical mirrors or the plurality of one-dimensional Fresnel concave lenses, or one diffusion film may correspond to the plurality of plano-concave cylindrical mirrors or the plurality of one-dimensional Fresnel concave lenses, or the plurality of diffusion films may correspond to one plano-concave cylindrical mirror or one one-dimensional Fresnel concave lens.

[0112] For example, the quantitative relationship between the first sub-converging member and the second sub-converging member may be that the orthographic projections of the plurality of first sub-converging members on the XY plane correspond to the orthographic projections of the plurality of second sub-converging members on the XY plane, or one first sub-converging member may correspond to the plurality of second sub-converging members, or multiple first sub-converging members may correspond to one second sub-converging member. For example, when the first sub-converging member is a plano-convex cylindrical mirror, and the second sub-converging member is a one-dimensional Fresnel convex lens, a convex lens, or a circular Fresnel lens, the plurality of plano-convex cylindrical mirrors may correspond to a plurality of one-dimensional Fresnel convex lenses, a plurality of convex lenses, or a plurality of circular Fresnel lenses, or one plano-convex cylindrical mirror may correspond to a plurality of one-dimensional Fresnel convex lenses, a plurality of convex lenses, or a plurality of circular Fresnel lenses, or multiple plano-convex cylindrical mirrors may correspond to a one-dimensional Fresnel convex lens, a convex lens, or a circular Fresnel lens.

[0113] For example, the above-mentioned one-dimensional Fresnel concave lens refers to a linear Fresnel concave lens, and the one-dimensional Fresnel convex lens refers to a linear Fresnel convex lens.

[0114] FIG. 3A to FIG. 5B FIG. 2 shows a side view of a backlight module provided by some embodiments of the present disclosure. FIG. 3A to FIG. 5B In the side view shown, (a) on the left is a plan view of the XZ plane, and (b) on the right is a plan view of the XY plane. FIG. 3A to FIG. 5BIn the side views shown, the left side (a) also uses a cross in a circle to indicate the first direction X, which indicates the direction perpendicular to the paper surface, and the right side (b) also uses a cross in a circle to indicate the second direction Y, which indicates the direction perpendicular to the paper surface. FIG. 3A to FIG. 5B The first direction X is the extension direction of the long side 1002 a of the light outlet 1002 , the second direction Y is the extension direction of the short side 1002 b of the light outlet 1002 , and the third direction Z is the direction perpendicular to the bottom surface 1001 .

[0115] refer to FIG. 3A to FIG. 5B In the backlight module 100 provided in some embodiments of the present disclosure, the diffusion of the diffusion element 121 includes first diffusion and then second diffusion of the light corresponding to the collimated light, the first diffusion is one of the diffusion in the first direction X and the diffusion in the second direction Y, and the second diffusion is the other of the diffusion in the first direction X and the diffusion in the second direction Y.

[0116] For example, the collimated light is converged by the converging element after being subjected to the first diffusion and the second diffusion processes, or the collimated light is converged by the converging element after being subjected to the first diffusion and before being subjected to the second diffusion.

[0117] For example, the convergence is at least a partial convergence, for example, a convergence without distinguishing between a first convergence and a second convergence, or a first convergence and a second convergence or a first convergence when there is a first convergence and a second convergence.

[0118] In the backlight module 100 provided in some embodiments of the present disclosure, the convergence of the convergence element 122 includes first convergence and second convergence. The first convergence is to converge the light after the first diffusion and before the second diffusion, and the second convergence is to converge the light after the second diffusion.

[0119] For example, the light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and the second diffusion processes, or the light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and before being subjected to the second diffusion.

[0120] For example, the first diffusion may include at least one diffusion, and the second diffusion may include at least one diffusion.

[0121] For example, the first convergence may include at least one convergence, and the second convergence may include at least one convergence.

[0122] like Figure 3A and Figure 3BAs shown, in the backlight module 100 provided in some embodiments of the present disclosure, the diffusion element 121 includes a diffusion film 301 and a plano-concave cylindrical mirror 302, and the converging element 122 includes a plano-convex cylindrical mirror 303. The diffusion film 301, the plano-concave cylindrical mirror 302, and the plano-convex cylindrical mirror 303 are arranged along the light emitting direction of the light emitted by the light source assembly. For example, the diffusion film 301, the plano-concave cylindrical mirror 302, and the plano-convex cylindrical mirror 303 are arranged in sequence.

[0123] like Figure 3A and Figure 3B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the diffusion film 301 is configured to diffuse the collimated light in a first direction X, the plano-concave cylindrical mirror 302 is configured to diffuse the light passing through the diffusion film 301 in a second direction Y, and the plano-convex cylindrical mirror 303 is configured to converge the light passing through the plano-concave cylindrical mirror 302 in the second direction Y.

[0124] For example, Figure 3A and Figure 3B As shown, the diffusion film 301 can at least diffuse the light distributed in the first direction X, or the diffusion degree in the first direction X is greater than the diffusion degree in the second direction Y. For example, the diffusion film 301 can be a 5°*1° beam shaper, but is not limited thereto.

[0125] For example, in Figure 3A and Figure 3B In the illustrated embodiment, in the first direction X, the number of light source assemblies 11 is relatively large, and the distribution length of light emitted by the plurality of light source assemblies 11 in the first direction X is almost equal to or slightly smaller than the length of the lamp tube 10. Therefore, a diffusion film 301 is used to diffuse the light in the first direction X so that it can at least cover the size of the light outlet 1002, and can increase the uniformity of the light distribution.

[0126] For example, the plano-concave cylindrical mirror 302 and the plano-convex cylindrical mirror 303 are used to control the light distributed in the second direction Y, and have almost no effect on the light in the first direction X. The plano-concave cylindrical mirror 302 can diffuse the collimated light and disperse it, so that the light can at least cover the size of the light outlet 1002 in the second direction Y. The plano-convex cylindrical mirror 303 can gather the diffused light and emit it in the required direction, and can also avoid the waste of light caused by too large a diffusion angle.

[0127] For example, Figure 3BAs shown, the direction control element 12 may further include a deflection diffusion film 300, which is arranged in the light emitting direction of the plano-convex cylindrical mirror 303. The light emitted from the plano-convex cylindrical mirror 303 may be deflected and diffused at a certain angle after passing through the deflection diffusion film 300, thereby avoiding the light emitting area being insufficiently large, and allowing the light to propagate in a desired direction (for example, toward the direction of the display panel), further improving the light utilization rate.

[0128] For example, there can be multiple deflection diffusion films 300, and multiple polarization diffusion films 300 are arranged along the light emission direction of the light emitted by the light source assembly 11 (for example, the main optical axis direction of the light), and each polarization diffusion film 300 is configured to propagate the light in a required direction (for example, toward the display panel).

[0129] The present disclosure Figure 3A and Figure 3B The backlight module provided by the illustrated embodiment improves light utilization by controlling light in different directions.

[0130] like Figure 1A , Figure 3A and Figure 3B , Fig. 8A As shown, the collimated light emitted by the multiple light source assemblies 11 is first controlled by the direction control element 12 so that the collimated light can cover the light outlet 1002 of the lamp tube 10 as much as possible, thereby forming a narrow light outlet area. The light finally passes through the light outlet 1002 and is emitted to a liquid crystal screen having a substantially identical area to the light outlet 1002, so as to form an eye box area corresponding to the narrow imaging area, and the narrow imaging area can be viewed by the driver and other passengers at the same time.

[0131] In the backlight module 100 provided in some embodiments of the present disclosure, the diffusion element 121 includes a first plano-concave cylindrical mirror 401 and a second plano-concave cylindrical mirror 402, the converging element 122 includes a first plano-convex cylindrical mirror 40a and a second plano-convex cylindrical mirror 40b, and the first plano-concave cylindrical mirror 401, the first plano-convex cylindrical mirror 40a, the second plano-concave cylindrical mirror 402, and the second plano-convex cylindrical mirror 40b are arranged along the light emitting direction (e.g., the main optical axis direction of the light) of the light emitted by the light source assembly 11. For example, the first plano-concave cylindrical mirror 401, the first plano-convex cylindrical mirror 40a, the second plano-concave cylindrical mirror 402, and the second plano-convex cylindrical mirror 40b are arranged in sequence.

[0132] In the backlight module 100 provided in some embodiments of the present disclosure, the first plano-concave cylindrical mirror 401 is configured to diffuse the collimated light in the second direction Y, the first plano-convex cylindrical mirror 40a is configured to converge the light passing through the first plano-concave cylindrical mirror 401 in the second direction Y, the second plano-concave cylindrical mirror 402 is configured to diffuse the light passing through the first plano-convex cylindrical mirror 40a in the first direction X, and the second plano-convex cylindrical mirror 40b is configured to converge the light passing through the second plano-concave cylindrical mirror 402 in the first direction X.

[0133] For example, Figure 4A and Figure 4B As shown, the first plano-concave cylindrical mirror 401 and the first plano-convex cylindrical mirror 40a are used to control the light distributed in the second direction Y, and have almost no effect on the light in the first direction X. The first plano-concave cylindrical mirror 401 can diffuse the collimated light and disperse it, so that the light can cover the size of the light outlet 1002 as much as possible in the second direction Y; the first plano-convex cylindrical mirror 40a can gather the diffused light and emit it in the required direction, and can also avoid the waste of light caused by too large a diffusion angle. For example, the required direction includes the main optical axis direction, but is not limited thereto.

[0134] For example, Figure 4A and Figure 4B As shown, the second plano-concave cylindrical mirror 402 and the second plano-convex cylindrical mirror 40b are used to control the light distributed in the first direction X, and have almost no effect on the light in the second direction Y. The plano-concave cylindrical mirror can diffuse the collimated light and disperse it, so that the light can cover the size of the light outlet 1002 as much as possible in the first direction X; the plano-convex cylindrical mirror can gather the diffused light and emit it in the required direction, and can also avoid the waste of light caused by too large a diffusion angle.

[0135] For example, Figure 4B As shown, the direction control element 12 also includes a deflection diffusion film 400, which is arranged in the light emitting direction of the second plano-convex cylindrical mirror 40b. The light emitted from the second plano-convex cylindrical mirror 40b can be deflected and diffused at a certain angle after passing through the deflection diffusion film 400, so that the light can be propagated in a desired direction (for example, toward the direction of the display panel), thereby further improving the light utilization rate.

[0136] For example, there can be multiple deflection diffusion films 400, and multiple polarization diffusion films 400 are arranged along the light emission direction of the light emitted by the light source assembly 11 (for example, the main optical axis direction of the light), and each polarization diffusion film 400 is configured to propagate the light in a required direction (for example, toward the display panel).

[0137] In this disclosure Figure 4Aand Figure 4B In the backlight module provided by the illustrated embodiment, the light is controlled in different directions, thereby improving the controllability of the light.

[0138] In the backlight module 100 provided in some embodiments of the present disclosure, the diffusion element 121 includes a first plano-concave cylindrical mirror 501 and a second plano-concave cylindrical mirror 502, the converging element 122 includes a one-dimensional converging lens or a two-dimensional converging lens 503, and the first plano-concave cylindrical mirror 501, the second plano-concave cylindrical mirror 502, and the convex lens 503 are arranged along the light emitting direction (for example, the main optical axis direction of the light) of the light emitted by the light source assembly 11. For example, the first plano-concave cylindrical mirror 501, the second plano-concave cylindrical mirror 502, and the convex lens 503 are arranged in sequence.

[0139] In the backlight module 100 provided in some embodiments of the present disclosure, the first plano-concave cylindrical mirror 501 is configured to diffuse the collimated light in the second direction Y, the second plano-concave cylindrical mirror 502 is configured to diffuse the light passing through the first plano-concave cylindrical mirror 501 in the first direction X, and the convex lens 503 is configured to converge the light passing through the second plano-concave cylindrical mirror 502 in the first direction X and the second direction Y.

[0140] like Figure 5B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the direction control element 12 also includes a deflection diffusion film 500, which is arranged in the light emitting direction of the converging element 122, and the deflection diffusion film 500 is configured to deflect and diffuse the light passing through the converging element 122 for output.

[0141] For example, the deflection diffusion film 500 is set in the light output direction of the convex lens 503. The light emitted from the convex lens 503 can be deflected and diffused at a certain angle after passing through the deflection diffusion film 500, so that the light can propagate in a required direction (for example, toward the display panel), further improving the light utilization rate.

[0142] For example, there can be multiple deflection diffusion films 500, and multiple polarization diffusion films 500 are arranged along the light emission direction of the light emitted by the light source assembly 11 (for example, the main optical axis direction of the light), and each polarization diffusion film 500 is configured to propagate the light in a required direction (for example, toward the display panel).

[0143] For example, Figure 5A and Figure 5BAs shown, the first plano-concave cylindrical mirror 501 is used to control the light distribution in the second direction Y, and has almost no effect on the light in the first direction X. The first plano-concave cylindrical mirror 501 can diffuse the collimated light and disperse it, so that the light in the second direction Y can cover the size of the light outlet 1002 as much as possible.

[0144] For example, Figure 5A and Figure 5B As shown, the second plano-concave cylindrical mirror 502 is used to control the light distribution in the first direction X, and has almost no effect on the light in the second direction Y. The plano-concave cylindrical mirror can diffuse the collimated light and disperse it, so that the light in the first direction X can also cover the size of the light outlet 1002 as much as possible.

[0145] For example, Figure 5A and Figure 5B As shown, the convex lens can gather the light diffused in the first X direction and the second direction Y to emit it in a desired direction, and can also avoid light waste caused by too large a diffusion angle.

[0146] The present disclosure Figure 5A and Figure 5B The backlight module provided by the illustrated embodiment improves the controllability of light by controlling light in different directions.

[0147] FIG. 3A to FIG. 5B The embodiments of the present disclosure using different direction control elements are shown. It should be noted that: FIG. 3A to FIG. 5B The process of direction control involved is: diffusion first, then convergence. The purpose of diffusion first is to diffuse the collimated light to cover the light outlet 1002, and the purpose of convergence is to converge the light in the required direction to avoid wasting light due to excessive diffusion angle of the light.

[0148] In the above embodiments, the light may be diffused by at least one of a diffusion film and a lens. For example, the diffusion film may be a one-dimensional diffusion film or a two-dimensional diffusion film. When the diffusion film is a one-dimensional diffusion film, the controllability of the light may be improved. The lens may be a one-dimensional lens or a two-dimensional lens. When the lens is a one-dimensional lens, the controllability of the light may be improved.

[0149] In the embodiments of the present disclosure, one dimension means in one direction, for example, on a line, and two dimensions means in two directions, for example, on a plane.

[0150] In the above embodiments, a lens may be used to converge the light. For example, the lens includes a one-dimensional lens or a two-dimensional lens. When the lens is a one-dimensional lens, the controllability of the light can be improved.

[0151] For example, the lamp tube 10 also has a converging effect. When the diffusion angle of the multiple collimated light source components 11 after being adjusted by the direction control element 12 is still large, the lamp tube 10 can further adjust the convergence of the light. Figure 1A In the example, the side of the lamp tube 10 is an inclined plane, and the light is converged through reflection on the inclined plane. In other examples, the side of the lamp tube 10 can also be set to a parabolic shape such as a collimating lamp cup 11b.

[0152] For example, the shape of the lamp tube 10 may be a parabola.

[0153] For example, the lamp tube 10 can be a fully reflective lamp tube (at least part of the light emitted by the light source 11a will be totally reflected on its surface when it enters the inner cavity of the lamp tube 10), or a reflective layer can be set in the inner cavity of the lamp tube 10 (for example, a reflective layer can be formed on the inner wall of the lamp tube 10 by aluminum plating).

[0154] For example, the arrangement of the collimating lamp cups 11b in the lamp tube 10 can be as follows: Figure 1A However, the arrangement of the collimating lamp cup 11b is not limited to Figure 1A In other embodiments, a plurality of collimating lamp cups 11 b may be arranged in an array on the bottom surface 1001 of the lamp tube 10 .

[0155] like Fig. 6A and Figure 6B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the backlight module 100 further includes a sensor 800, and the sensor 800 is configured to detect external light incident thereon and send a signal.

[0156] like Figure 6B As shown, in the backlight module 100 provided in some embodiments of the present disclosure, the plurality of light source assemblies 11 include a plurality of first light source assemblies 1101 and a plurality of second light source assemblies 1102, the plurality of first light source assemblies 1101 and the plurality of second light source assemblies 1102 are arranged axially symmetrically with respect to the symmetry axis A0, and are respectively located on both sides of the symmetry axis A0, and the sensor 800 is located between the plurality of first light source assemblies 11 and the plurality of second light source assemblies 11. Fig. 6A and Figure 6B As shown, the symmetry axis A0 extends in the third direction Z.

[0157] In the backlight module 100 provided in some embodiments of the present disclosure, the orthographic projection of the light source assembly 11e on the plane where the sensor 800 is located at least partially overlaps with the sensor 800, and the at least overlapping portion can transmit external light.

[0158] In the backlight module 100 provided in some embodiments of the present disclosure, in order to avoid affecting the performance of the sensor 800, at least a portion of the light source assembly 11 is located directly above the sensor 800, and the portion of the light source assembly 11 located directly above the sensor 800 can transmit infrared light.

[0159] like Fig. 6A and Figure 6B As shown, the external ambient light can reach the sensor 800 after passing through the light outlet of the HUD, the reflector group and the display panel 200. After the sensor 800 detects the external light signal, it issues a warning or triggers a defense to prevent screen burn-in. For example, the external light signal includes at least one of the intensity and temperature of the light.

[0160] like Figure 6B The reflective elements 11 e shown are arranged symmetrically, so that a larger area can be used to install the sensor 800; accordingly, the two reflective elements directly above the sensor 800 have infrared transmission characteristics to avoid affecting the performance of the sensor 800.

[0161] like Figure 1B , Figure 1C , Fig. 6A and Figure 6B As shown, the arrangement of the multiple light source assemblies 11 can be as follows Figure 1B and Fig. 6A As shown, the plurality of light source assemblies 11 are arranged in sequence, and the placement of the plurality of light source assemblies 11 is consistent. The arrangement of the plurality of light source assemblies 11 can be as follows: Figure 1C and Figure 6B As shown, the plurality of light source assemblies 11 are arranged in sequence, and the plurality of light source assemblies 11 are arranged in an axisymmetric manner with respect to the symmetry axis A0.

[0162] Figure 7 Schematic diagram of a lamp tube in a backlight module provided in some embodiments of the present disclosure. In the backlight module 100 provided in some embodiments of the present disclosure, Figure 7 As shown, a reflecting surface RF is provided on the inner wall 10c of the housing 10a to adjust the direction of the light irradiated on the reflecting surface so as to emit toward the light outlet 1002 . Figure 7 A side surface 1003 of the lamp barrel 10 is shown. Figure 1A , FIG. 3A to FIG. 5B The side surface 1004 of the lamp tube is also shown. The bottom surface 1001, the side surface 1003, and the inner wall of at least one of the side surfaces 1004 are provided with a reflecting surface RF.

[0163] like Fig. 8A and Figure 8B As shown, some embodiments of the present disclosure further provide a head-up display device, including a display panel 200 and any of the above-mentioned backlight modules 100 .

[0164] In some embodiments of the present disclosure, the emitted light is emitted toward the display panel 200 . Figure 1A , FIG. 3A to FIG. 5B , Fig. 8A ,as well as Figure 8B The emitted light L0 is shown. The emitted light L0 is emitted from the backlight module toward the display panel 200 .

[0165] Fig. 8A and Figure 8B The arrangement of the backlight module in the inner cavity of the lamp tube is schematically shown. Fig. 8A Two light source assemblies 11 and a direction control element 12 located thereon are shown, but all of the light source assemblies 11 and the direction control element 12 are not shown. Figure 8B One light source assembly 11 and a direction control element 12 located above the light source assembly 11 are shown, but all of the light source assemblies 11 and the direction control element 12 are not shown.

[0166] like Figure 8C and Fig.8D As shown, the backlight module further includes at least one light homogenizing element 13 , which is disposed on a side of the direction control element 122 away from the light source assembly 11 . Alternatively, at least one light homogenizing element 13 is disposed on a side of the direction control element 122 away from the diffusion element 121 .

[0167] A light homogenizing element 13 (such as Figure 8C As shown), it is used to improve the uniformity of light. The light homogenizing element 13 can be located in the lamp tube 10 or on the display panel 200 (as shown in FIG. Fig.8D For example, the light homogenizing element 13 includes a diffuser. The embodiment of the present disclosure does not limit the location of the light homogenizing element 13, as long as it can homogenize the light.

[0168] Some embodiments of the present disclosure further provide a head-up display device, including a display panel 200 and any of the above-mentioned backlight modules 100 , wherein the display panel 200 is located at the light outlet 1002 of the lamp tube 10 , and the area of ​​the display panel 200 is substantially the same as the area of ​​the light outlet 1002 .

[0169] For example, in some embodiments, the head-up display device further includes a transflective element, and the long side 1002a of the light outlet 1002 of the lamp tube 10 is configured to correspond to the left and right direction of the transflective element. For example, the transflective element includes a curved mirror, but is not limited thereto. The transflective element may also be referred to as a reflective imaging unit.

[0170] For example, the collimated light first passes through the direction control element 12 ( Figure 1A Not shown, refer to FIG. 3A to FIG. 5B) after direction control, the collimated light can cover at least the light outlet 1002 of the lamp tube 10 as much as possible, thereby forming a narrow light outlet area, and the light finally passes through the light outlet 1002 and is emitted to the liquid crystal screen with substantially the same area as the light outlet 1002, so as to form a narrow imaging area, and the narrow imaging area can be viewed by the driver and other passengers at the same time. The embodiment of the present disclosure does not limit the area of ​​the liquid crystal screen, which can be the same as the area of ​​the light outlet 1002, or different, and can be set as needed.

[0171] For example, the main function of the direction control element 12 is to adjust the direction so that the light is incident on the liquid crystal screen. The display panel 200 and the light outlet 1002 may not be completely aligned.

[0172] For example, in some embodiments of the present disclosure, the polarization conversion element 11d is located above the collimating lamp cup 11b and has an angle with the bottom surface 1001 of the lamp tube 10. For example, the polarization splitting element 11c is located above the collimating lamp cup 11b and has an angle with the bottom surface 1001 of the lamp tube 10. For example, the reflective element 11e is located above the collimating lamp cup 11b and has an angle with the bottom surface 1001 of the lamp tube 10. That is, the polarization conversion element 11d, the polarization splitting element 11c, and the reflective element 11e are all arranged obliquely relative to the bottom surface 1001 of the lamp tube 10.

[0173] Some embodiments of the present disclosure also provide a vehicle, comprising any of the above-mentioned head-up display devices.

[0174] For example, the means of transportation include cars, but are not limited thereto.

[0175] Fig. 9 A schematic diagram of the optical path of a HUD device included in a vehicle is shown in FIG. Fig. 9 As shown, the outgoing light of the head-up display device 01 is reflected by the reflective element 02, and is reflected by the transflective element 03 to reach the eye box EB0. For example, the transflective element 03 is a windshield of a vehicle. The reflective element 02 can also be called a reflective part. The transflective element 03 can also be called a reflective imaging part.

[0176] For example, the long side 1002 a of the light outlet 1002 of the lamp tube 10 corresponds to the left and right direction of the transflective element (windshield) 03 .

[0177] Fig. 9 The embodiment shown is described by taking the transflective element 03 as a windshield of a vehicle as an example. In other embodiments, the transflective element may be included in a head-up display device, and the transflective element may include a curved mirror.

[0178] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, comprising: a plurality of light source assemblies configured to provide collimated light; as well as A direction control component, the direction control component is located at a light-emitting side of at least one light source component among the plurality of light source components, the direction control component comprising a diffusion element and a convergence element; The collimated light is diffused by the diffusion element to increase the light exiting area, and is converged by the convergence element to adjust the direction of the exiting light; The backlight module further comprises at least one lamp tube, wherein the lamp tube comprises a shell and an inner cavity at least surrounded by the shell, the plurality of light source components and at least part of the direction control component are located in the inner cavity of the at least one lamp tube, and the lamp tube is configured to converge the light adjusted by the direction control component. The diffusion of the diffusion element includes diffusion in the first direction only, or first diffusion and then second diffusion. The first diffusion is one of diffusion in the first direction and diffusion in a second direction, and the second diffusion is the other of diffusion in the first direction and diffusion in the second direction. The first direction intersects the second direction.

2. The backlight module according to claim 1, wherein: Diffusion of the diffusion element sequentially includes diffusion in the first direction and diffusion in the second direction.

3. The backlight module according to claim 1, wherein: The backlight module comprises a lamp tube, and the plurality of light source components and the direction control component are located in the inner cavity of the lamp tube.

4. The backlight module according to claim 1, wherein: The lamp tube has a light outlet, and the light outlet includes a long side and a short side. The length of the long side is greater than the length of the short side. The long side of the light outlet extends along the first direction, and the short side of the light outlet extends along the second direction.

5. The backlight module according to claim 4, wherein: The collimated light at least covers the light outlet after the direction is controlled by the direction control component.

6. The backlight module according to claim 1, wherein: The inner wall of the shell is provided with a reflecting surface to adjust the direction of the light irradiated on the reflecting surface so as to emit it toward the light outlet of the lamp tube.

7. The backlight module according to claim 1, wherein: The lamp tube is parabolic.

8. The backlight module according to any one of claims 1 to 7, wherein: The diffusion element comprises a one-dimensional diffusion element, and the convergence element comprises a one-dimensional convergence lens and / or a two-dimensional convergence lens.

9. The backlight module according to claim 8, wherein: The one-dimensional diffusion element includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear concave Fresnel lens; the one-dimensional converging lens includes at least one of a plano-convex cylindrical mirror and a linear convex Fresnel lens; and the two-dimensional converging lens includes at least one of a convex lens and a circular Fresnel lens.

10. The backlight module according to any one of claims 1 to 7, wherein: The collimated light is first diffused by the diffusion element to increase the light exiting area, and then converged by the convergence element to adjust the direction of the exiting light.

11. The backlight module according to claim 10, wherein: The convergence of the convergence element includes a first convergence and a second convergence. The first convergence is to converge the light after the first diffusion and before the second diffusion. The second convergence is to converge the light after the second diffusion.

12. The backlight module according to claim 10, wherein: The light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and the second diffusion processing, or the light corresponding to the collimated light is converged by the converging element after being subjected to the first diffusion and before being subjected to the second diffusion.

13. The backlight module according to any one of claims 1 to 7, wherein: The diffusion element includes a diffusion film and at least one of a plano-concave cylindrical mirror and a linear concave Fresnel lens, the converging element includes at least one of a plano-convex cylindrical mirror and a linear convex Fresnel lens, and the diffusion film, at least one of the plano-concave cylindrical mirror and the linear concave Fresnel lens, and at least one of the plano-convex cylindrical mirror and the linear convex Fresnel lens are arranged along the light emitting direction of the light emitted by the light source assembly.

14. The backlight module according to claim 13, wherein: The diffusion film is configured to diffuse the collimated light in the first direction, at least one of the plano-concave cylindrical mirror and the linear concave Fresnel lens is configured to diffuse the light passing through the diffusion film in the second direction, and at least one of the plano-convex cylindrical mirror and the linear convex Fresnel lens is configured to converge the light passing through the plano-concave cylindrical mirror in the second direction.

15. The backlight module according to any one of claims 1 to 7, wherein: The diffusion element includes a first sub-diffuser and a second sub-diffuser, the converging element includes a first sub-converging element and a second sub-converging element, and the first sub-diffuser, the second sub-diffuser, the first sub-converging element, and the second sub-converging element are arranged along the light emitting direction of the light emitted by the light source assembly; or The diffusion element includes a first sub-diffuser and a second sub-diffuser, the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, and the first sub-diffuser, the second sub-diffuser, and the at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly.

16. The backlight module according to claim 15, wherein: In the case where the first sub-diffuser, the second sub-diffuser, the first sub-converging member, and the second sub-converging member are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser is configured to diffuse the light incident thereon in the second direction, the first sub-converging member is configured to converge the light passing through the first sub-diffuser in the second direction, the second sub-diffuser is configured to diffuse the light passing through the first sub-converging member in the first direction, and the second sub-converging member is configured to converge the light passing through the second sub-diffuser in the first direction; In which, when the first sub-diffuser, the second sub-diffuser, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser is configured to diffuse the collimated light in the second direction, the second sub-diffuser is configured to diffuse the light passing through the first sub-diffuser in the first direction, and the plano-convex cylindrical mirror is configured to converge the light passing through the second sub-diffuser in the first direction and the second direction.

17. The backlight module according to claim 15, wherein: The first sub-diffuser includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear concave Fresnel lens; the second sub-diffuser includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear concave Fresnel lens; the first sub-convergent element includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens; the second sub-convergent element includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.

18. The backlight module according to any one of claims 1 to 7, wherein: The direction control component further includes a deflection diffusion film, which is arranged in the light emitting direction of the converging element, and is configured to deflect and diffuse the light passing through the converging element for emission.

19. The backlight module according to any one of claims 1 to 7, wherein: The light source assembly includes a light source and a collimating lamp cup. The light source is configured to emit light, and the collimating lamp cup is configured to collimate at least a portion of the light emitted by the light source.

20. The backlight module according to claim 19, wherein: The light source assembly includes a polarization splitter element and a polarization conversion element. The polarization splitter element is configured to split the light incident thereon into a first polarized light and a second polarized light with different propagation directions and polarization states. The polarization conversion element is configured to convert the light corresponding to the second polarized light into a third polarized light, and the third polarized light has the same polarization state as the first polarized light.

21. The backlight module according to claim 20, further comprising a reflective element, wherein: The reflective element is configured to reflect light corresponding to the first polarized light or light corresponding to the second polarized light.

22. The backlight module according to claim 21, wherein: The polarization conversion element is located on a side of the polarization beam splitting element away from the light source, on a side of the reflection element away from the light source, or between the polarization beam splitting element and the reflection element.

23. The backlight module according to claim 21, further comprising a sensor, wherein: The sensor is configured to detect external light incident thereon and emit a signal.

24. The backlight module according to claim 23, wherein: The multiple light source assemblies include multiple first light source assemblies and multiple second light source assemblies. The multiple first light source assemblies and the multiple second light source assemblies are arranged axially symmetrically with respect to a symmetry axis and are respectively located on both sides of the symmetry axis. The sensor is located between the multiple first light source assemblies and the multiple second light source assemblies.

25. The backlight module according to claim 24, wherein: The tops of the reflective elements of the two light source assemblies which are closest to the symmetry axis and are arranged on both sides of the symmetry axis are in contact.

26. The backlight module according to claim 24, wherein: The two reflective elements directly above the sensor have infrared transmission characteristics.

27. The backlight module according to claim 24, wherein: The sensor is arranged at the axis of symmetry.

28. The backlight module according to claim 24, wherein: The orthographic projection of the light source assembly on the plane where the sensor is located at least partially overlaps with the sensor, and the at least overlapping portion can transmit external light.

29. The backlight module according to any one of claims 1 to 7, further comprising at least one light homogenizing element, wherein: The at least one light homogenizing element is arranged on a side of the direction control component away from the light source component.

30. A head-up display device, comprising a display panel and a backlight module according to any one of claims 1-29.

31. The head-up display device according to claim 30, wherein: The same eye box area of ​​the head-up display device is configured to allow users in a driving position and a passenger seat to view a virtual image of the head-up display device.

32. A head-up display device, comprising a display panel and a backlight module according to any one of claims 4 to 6, wherein: The display panel is located at the light outlet of the lamp tube.

33. A means of transportation, comprising the backlight module according to any one of claims 1 to 29 or the head-up display device according to any one of claims 30 to 32.

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