WO2023051732A1

WO2023051732A1 - Backlight module, head-up display device, and vehicle

Info

Publication number: WO2023051732A1
Application number: PCT/CN2022/122819
Authority: WO
Inventors: 吴慧军; 徐俊峰
Original assignee: 未来（北京）黑科技有限公司
Priority date: 2021-09-30
Filing date: 2022-09-29
Publication date: 2023-04-06

Abstract

A backlight module (100), a head-up display device (01), and a vehicle. The backlight module (100) comprises: a plurality of light source assemblies (11) configured to provide collimated light; and a direction control assembly (12), the direction control assembly (12) being located at a light emission side of at least one light source assembly (11) of the plurality of light source assemblies (11), and the direction control assembly (12) comprising a diffusion element (121) and a convergence element (122), wherein the collimated light is diffused by the diffusion element (121) to increase a light emission area and is converged by the convergence element (122) to adjust the direction of emitted light, so as to make the head-up display device (01) comprising the backlight module (100) form a large eye-box region.

Description

Backlight module, head-up display device and vehicle

Cross References to Related Applications

For all purposes, this patent application requires Chinese Patent Application No. 202111162367.X filed on September 30, 2021, Chinese Patent Application No. The priority of the Chinese patent application No. 202221767038.8 filed on 18th, the content of the above Chinese patent application is cited in its entirety as a part of this application.

technical field

Embodiments of the present disclosure relate to a backlight module, a head-up display device, and a vehicle.

Background technique

The head up display (HUD) uses a reflective optical design to finally project the light emitted by the image source onto the imaging window (such as the imaging plate, windshield, etc.), and the user (such as the driver) does not need to look down. You can see the screen directly. For example, HUD can avoid the driver's distraction caused by looking down at the dashboard during driving, improve the driving safety factor, and also bring a better driving experience.

Contents of the invention

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

An embodiment of the present disclosure provides a backlight module, including: a plurality of light source assemblies configured to provide collimated light; and a direction control assembly located at least one of the plurality of light source assemblies On the light exit side, the direction control assembly includes a diffusing element and a converging element; the collimated light is diffused by the diffusing element to increase the light exit area, and converged by the converging element to adjust the direction of the outgoing light.

For example, the diffusion of the diffusion element includes at least one of diffusion in a first direction and diffusion in a second direction, the first direction intersecting the second direction.

For example, the diffusing element includes a first sub-diffuser and a second sub-diffuser, the first sub-diffuser is configured to diffuse light incident thereon in the second direction, the second The sub-diffuser is configured to diffuse light passing through the first sub-diffuser in the first direction.

For example, the backlight module further includes at least one lamp tube, the lamp tube includes a housing and an inner cavity at least surrounded by the housing, the plurality of light source components and at least part of the direction control components are located in the at least one In the inner cavity of a lamp tube.

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, and the long side of the light outlet extends along a first direction, so The short side of the light outlet extends along the second direction.

For example, the collimated light at least covers the light outlet after being directed by the direction control component.

For example, the inner wall of the housing is provided with a reflective surface to adjust the direction of the light irradiated on the reflective surface so that it is emitted toward the light outlet.

For example, the lamp tube is in the shape of a parabola.

For example, the diffusing element comprises a one-dimensional diffusing element, and the converging element comprises a one-dimensional converging lens and/or a two-dimensional converging lens.

For example, the one-dimensional diffusing element includes at least one of a plano-concave cylindrical mirror, a diffusing film, and a linear Fresnel concave lens, and the one-dimensional converging element includes at least one of a plano-convex cylindrical mirror, a linear Fresnel convex lens, the The two-dimensional converging lens includes at least one of a convex lens and a circular Fresnel lens.

For example, the diffusion element performs first diffusion and then second diffusion on the light corresponding to the collimated light, and the first diffusion is one of diffusion in the first direction and diffusion in the second direction, The second diffusion is the other of diffusion in the first direction and diffusion in the second direction.

For example, the converging element includes a first sub-converging part and a second sub-converging part, the first sub-converging part is configured to converge light rays incident thereon in the second direction, and the second sub-converging part The two sub-converging elements are configured to converge the light passing through the first sub-converging element in the first direction.

For example, the converging of the converging element includes first converging and second converging. The rays after the second diffusion are converged.

For example, the light corresponding to the collimated light is converged by the converging element after being processed by the first diffusion and the second diffusion, or the light corresponding to the collimated light is converged by the first diffusion and converged by the converging element before being diffused by the second.

For example, the diffusing element includes a diffusing film and includes at least one of a plano-concave cylindrical mirror and a linear Fresnel concave lens, the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, and the diffusing film , at least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens emit light along the light emitted by the light source assembly direction to set.

For example, the diffusion film is configured to diffuse the collimated light in a first direction, and at least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens is configured to diffuse the collimated light rays passing through the diffusion film. The light rays are diffused in the second direction, at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens is configured to pass through at least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens A light ray converges in the second direction.

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

For example, when the first sub-diffusion piece, the second sub-diffusion piece, the first sub-convergence piece, and the second sub-convergence piece are arranged along the light emitting direction of the light emitted by the light source assembly In some cases, the first sub-diffuser is configured to diffuse the light incident thereon in the second direction, and the second sub-diffuser is configured to diffuse light passing through the first sub-diffuser. The light diffuses in the first direction, the first sub-converging part is configured to converge the light passing through the second sub-diffusing part in the second direction, and the second sub-converging part configured to converge the light passing through the first sub-converging part in the first direction; between the first sub-diffusing part, the second sub-diffusing part, and the plano-convex cylindrical mirror and In the case where the at least one of the linear Fresnel convex lenses is arranged along the light emitting direction of the light emitted by the light source assembly, the first sub-diffuser is configured to dissipate the collimated light in the second direction The second sub-diffuser is configured to diffuse the light passing through the first sub-diffuser in a first direction, and the plano-convex cylindrical mirror and the linear Fresnel convex lens The at least one of is configured to converge the light passing through the second sub-diffuser in the first direction or in the second direction.

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, and the second sub-diffuser includes a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens. At least one of the first sub-converging elements includes at least one of a plano-convex cylindrical lens, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens, and the second sub-converging element includes a plano-convex cylindrical lens, At least one of a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.

For example, the direction control element further includes a deflection diffusion film, the deflection diffusion film is arranged in the light emitting direction of the converging element, and the deflection diffusion film is configured to deflect the light passing through the converging element Refracted diffuse exit.

For example, the light source assembly includes a light source configured to emit light and a collimator configured to collimate at least part of the light emitted by the light source.

For example, the light source assembly includes a polarization beam splitting element and a polarization conversion element, and the polarization beam splitting element is configured to split the light beams irradiated thereon into first polarized light and second polarized light with different propagation directions and different polarization states. light, 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.

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

For example, the polarization conversion element is located on the side of the polarization beam splitting element away from the light source, on the side of the reflection element away from the light source, or between the polarization beam splitting element and the reflection element .

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

For example, the multiple light source components include multiple first light source components and multiple second light source components, and the multiple first light source components and the multiple second light source components are arranged axisymmetrically with respect to the axis of symmetry, and are respectively located on both sides of the symmetry axis, and the sensor is located between the plurality of first light source components and the plurality of second light source components.

For example, the orthographic projection of the light source assembly on the plane where the sensor is located overlaps at least part of the sensor, and the at least part of the overlap can transmit external light.

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

Embodiments of the present disclosure also provide a backlight module, the backlight module includes a plurality of light source components and a collimation part, the collimation part includes at least one collimation part, the at least one collimation part is located in the collimation layer, the A plurality of light source components are located on the light source layer, and the area between the light source layer and the collimation layer is at least a continuous gas medium layer.

For example, the collimating part is configured to transmit and collimate the light emitted by the light source module.

For example, the gas medium layer is adjacent to the collimation layer and the light source layer; or, the direction control component further includes a plurality of transparent light-gathering parts, and the light source component corresponding to the transparent light-gathering parts emits The light passes through the collimating part after passing through the transparent light concentrating part, the plurality of transparent light concentrating parts are located in the light concentrating layer, and the gas medium layer is located in the collimating layer and the light concentrating layer between.

For example, the gas medium layer is adjacent to the collimating layer and the light concentrating layer; and/or, the transparent light concentrating part has a groove for accommodating a corresponding light source component; and/or, the transparent concentrating The light part is bonded to the corresponding light source component; and/or, the light-emitting surface of the transparent light-gathering part is a convex surface that protrudes away from the corresponding light source component; and/or, the light-gathering part is a plano-convex lens.

For example, a plurality of the light source assemblies are arranged in an array; each of the light source assemblies corresponds to one of the collimation sections; or, a plurality of the light source assemblies are arranged in an array, and each of the collimation sections receives at least two of the collimation sections. The light emitted by the light source assembly.

For example, the collimating part includes at least one collimating element, the collimating element includes a first convex surface and a second convex surface, and at least part of the light emitted by the light source assembly enters the collimating element through the first convex surface. and emitted from the second convex surface, and the collimator is configured such that: the divergence angle of the light emitted from the second convex surface is smaller than the divergence angle of the light incident from the first convex surface.

For example, the collimator further includes: a sub-light incident surface located at the edge of the first convex surface; a sub-light exit surface located at the edge of the second convex surface; a side surface connecting the sub-light incident surface and the sub-light exit surface Part of the light emitted by the light source assembly enters the collimator through the sub-light incident surface, and part of the light entering the collimator is reflected by the side surface and then emitted from the sub-light exit surface.

For example, the sub-light incident surface is arranged around the first convex surface and is at least partially flat; A light receiving cavity opening toward the light source assembly is defined.

For example, the collimating part includes at least one collimating element, and the at least one collimating element includes a plurality of lenses, and the collimating element is configured such that the divergence angle of the light emitted from the collimating element is smaller than that The divergence angle of the light rays of the collimating element; or, the at least one collimating element includes a collimating film, and the collimating element is configured such that: the divergence angle of the light rays exiting the collimating element is smaller than that entering the collimating element The divergence angle of the rays of the straight piece.

For example, the light emitted by the light source assembly enters the transparent light collecting part, the light emitted from the transparent light collecting part enters the collimator, and the transparent light collecting part is configured to emit the transparent The divergence angle of the light in the light collecting part is smaller than the divergence angle of the light entering the transparent light collecting part.

For example, the light-emitting surface of the transparent light-gathering portion includes at least a first light-emitting curved surface, and the light source assembly is embedded inside the transparent light-gathering portion and is located at a focal point of the first light-emitting curved surface.

For example, the light emitting surface of the transparent light concentrating part is a convex paraboloid, and the light source assembly is embedded inside the transparent light concentrating part and is located at the focal point of the paraboloid; or, the light emitting surface of the transparent light concentrating part The surface is a convex arc surface, and the light source assembly is embedded inside the transparent light-gathering part and is located at the focal point of the arc-shaped surface; or, the light-emitting surface of the transparent light-gathering part includes a first light-emitting curved surface and the second light-emitting side, the first light-emitting curved surface is a convex paraboloid, the light source assembly is embedded inside the transparent light-gathering part and is located at the focal point of the paraboloid; or, the transparent light-gathering part The light-emitting surface includes a first light-emitting curved surface and a second light-emitting side surface, the first light-emitting curved surface is a raised arc surface, and the light source assembly is embedded inside the transparent light-collecting portion and is located at the focal point of the arc surface place.

An embodiment of the present disclosure provides a backlight module, including a plurality of light source components and a collimator, and the light emitted by the plurality of light source components passes through the collimator, wherein the collimator includes at least one collimator The at least one collimator is located in the collimation layer, the plurality of light source components are located in the light source layer, and the area between the light source layer and the collimation layer is at least a continuous gas medium layer.

An embodiment of the present disclosure provides a backlight module, including a light source part having a plurality of light source components and a collimation part, the light emitted by the multiple light source components passes through the collimation part, wherein at least part of the multiple light source components Each of the light source assemblies does not include a reflector for reflecting light emitted by the light source assembly.

For example, the light emitted by the light source component is directly incident on the collimating part; or the backlight module includes a direction control component, and the direction control component includes the collimating part and a plurality of transparent light concentrating parts, and the The light emitted by the light source assembly corresponding to the transparent light concentrating part passes through the collimation part after passing through the transparent light concentrating part, the multiple transparent light concentrating parts are located in the light concentrating layer, and the gas medium layer is located in the between the collimating layer and the light concentrating layer.

For example, the light emitted from the light concentrating part is directly incident on the collimation part; and/or, the transparent light concentrating part has a groove for accommodating a corresponding light source component; and/or, the transparent light concentrating part and/or, the light-emitting surface of the transparent light-gathering part is a convex surface that protrudes away from the corresponding light source module; and/or, the light-gathering part is a plano-convex lens.

An embodiment of the present disclosure also provides a head-up display device, including a display panel and any one of the above-mentioned backlight modules.

For example, the same eye box area of the head-up display device is configured to allow users in the driving position and the co-pilot position to watch the virtual image of the head-up display device.

An embodiment of the present disclosure also provides a head-up display device, including a display panel and any one of the above-mentioned backlight modules, the display panel is located at the light outlet of the lamp tube.

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-right direction of the transflective element.

For example, after the collimated light is processed by the direction control component, the divergence angle in the first direction is θ1, the divergence angle in the second direction is θ2, and the length of the eye box area in the horizontal direction is h. The length in the vertical direction is h', θ1≤arctanh/2D, θ2≤arctan h'/2D, and D is the propagation path length of the outgoing light of the backlight module from the backlight module to the eye box area.

An embodiment of the present disclosure also provides a vehicle, including any one of the above-mentioned backlight modules or any one of the above-mentioned head-up display devices.

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-right direction of the windshield.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present disclosure more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure .

FIG. 1A is a schematic diagram of a backlight module provided by some embodiments of the present disclosure.

FIG. 1B is a schematic diagram of a light source assembly in the backlight module shown in FIG. 1A .

1C to 1F are schematic views of another arrangement of light source components in a backlight module according to some embodiments of the present disclosure.

2A to 2C are schematic diagrams of the collimated light source in the light source assembly of the backlight module provided by some embodiments of the present disclosure.

3A to 5B are schematic diagrams of a direction control component in a backlight module provided by some embodiments of the present disclosure.

FIG. 6A is a schematic diagram of another backlight module provided by some embodiments of the present disclosure.

FIG. 6B is a schematic diagram of another backlight module provided by some embodiments of the present disclosure.

7A to 7I are schematic diagrams of a direction control component in a backlight module provided by some embodiments of the present disclosure.

Fig. 8 is a schematic diagram of a light tube in a backlight module provided by some embodiments of the present disclosure.

9 to 12 are schematic diagrams of a head-up display device provided by some embodiments of the present disclosure.

Fig. 13 is a schematic diagram of an optical path of a HUD device included in a vehicle.

14A is a schematic diagram of a collimator according to an embodiment of the present disclosure.

FIG. 14B is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in FIG. 14A .

Fig. 15A is a schematic diagram of a structure of a collimator according to an embodiment of the present disclosure.

Fig. 15B is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in Fig. 15A.

FIG. 16A is a first schematic diagram of a transparent light-gathering portion according to an embodiment of the present disclosure.

Fig. 16B is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in Fig. 16A.

Fig. 17 is a second schematic diagram of the transparent light-gathering part of the embodiment of the present disclosure.

FIG. 18 is a third schematic diagram of a transparent light-gathering part according to an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some of the embodiments of the present disclosure, not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative effort fall within the protection scope of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "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. Likewise, "comprises" or "comprises" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, and do not exclude other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

"At least one" means one or more; "a plurality" means at least two.

In the technology known by the inventor, the eye box area of the HUD is small, which is difficult to meet the practical needs of users.

FIG. 1A is a schematic diagram of a backlight module provided by some embodiments of the present disclosure. FIG. 1B is a schematic diagram of a light source assembly in the backlight module shown in FIG. 1A . FIG. 1C is a schematic diagram of another arrangement of light source components in a backlight module according to some embodiments of the present disclosure. 2A to 2C are schematic diagrams of the collimated light source in the light source assembly of the backlight module provided by some embodiments of the present disclosure. 3A to 5B are schematic diagrams of a direction control component in a backlight module provided by some embodiments of the present disclosure. FIG. 6A is a schematic diagram of another backlight module provided by some embodiments of the present disclosure. FIG. 6B is a schematic diagram of another backlight module provided by some embodiments of the present disclosure. Fig. 8 is a schematic diagram of a light tube in a backlight module provided by some embodiments of the present disclosure. 9 to 12 are schematic diagrams of a head-up display device provided by some embodiments of the present disclosure. The following description will be made with reference to FIGS. 1A to 12 .

As shown in FIG. 1A , FIG. 3A to FIG. 5B , some embodiments of the present disclosure provide a backlight module 100 , including: a plurality of light source components 11 and a direction control component 12 . The plurality of light source assemblies 11 are configured to provide collimated light. Figure 1A does not show the directional control assembly 12, which is shown in Figures 3A-5B. The direction control component 12 is provided to improve the uniformity of the backlight and the uniformity of the display screen. The arrangement of the direction control element 12 can reduce the number of light sources provided, lower the cost, and reduce heat generation.

For example, collimated light rays refer to parallel or nearly parallel light rays, and the divergence angle of the collimated light rays is smaller, which is more conducive to control.

For example, the directional control element 12 may include at least one of a lens, a diffuser film, and a deflection diffuser film.

As shown in FIGS. 3A to 5B , the direction control assembly 12 is located on the light emitting side of at least one light source assembly 11 among the plurality of light source assemblies 11 . The propagation of light is shown in FIG. 1A , FIG. 3A to FIG. 5B . The upper side of the light source assembly 11 is its light emitting side.

As shown in FIGS. 3A-5B , the directional control assembly 12 includes a diffusing element 121 and a converging element 122 . As shown in FIG. 3A to FIG. 5B , the collimated light is diffused by the diffusing element 121 to increase the light emitting area, and converged by the converging element 122 to adjust the direction of the outgoing light.

For example, the light emitting area refers to the area where light is emitted. For example, after the collimated light is diffused by the diffusing element, the light emitting area increases. For example, after the collimated light is diffused by the converging element, the light exit area decreases.

For example, a diffusing element 121 is provided to enlarge the light emitting surface. The main optical axis of the light passing through the diffusing element 121 does not change.

For example, a converging element 122 is provided to adjust the light emitting direction of the light. 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.

The backlight module 100 provided by some embodiments of the present disclosure can make the head-up display device including the backlight module have a larger eye box area by controlling the light, so that passengers other than the driver (such as co-pilot passengers) Viewing the virtual image of the head-up display device, for example, the head-up display device may have an eye box area for the driver and co-pilot passengers to watch the virtual image.

For example, controlling the direction of the light by the direction control component 12 includes firstly diffusing the light and then converging the light.

The backlight module 100 provided by some embodiments of the present disclosure controls light to form an imaging area that can be viewed by the driver and passengers. The backlight module 100 provided by some embodiments of the present disclosure can form a larger imaging area, allowing passengers other than the driver (such as the co-pilot passenger) to watch the picture.

As shown in FIG. 1A , in the backlight module 100 provided by 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. As shown in FIG.

For example, as shown in FIG. 1A to FIG. 6B , in the backlight module 100 provided by some embodiments of the present disclosure, the light source assembly 11 includes a light source 11a, a collimator 11b, a polarization splitting element 11c, and a polarization conversion element 11d. 11a is configured to emit light, and the collimator 11b is configured to collimate at least part of the light emitted by light source 11a. The collimating part 11b includes a collimating lamp cup, but is not limited thereto.

For example, the light source assembly 11 further includes a polarization splitting element 11c and a polarization conversion element 11d. The polarization splitting element 11c is configured to convert the light irradiated thereon into two beams of light with different propagation directions and different polarization states. The polarization conversion element 11d configured to switch the polarization state of light impinging on it.

For example, the light source assembly 11 further includes a reflective element 11e configured to adjust the propagation direction of the light irradiated thereon, so as to achieve the effect of light recovery and improve light utilization efficiency.

For example, the light source assembly includes a polarization splitting element 11c and a polarization conversion element 11d, and the polarization splitting element 11c is configured to split the beams of light irradiated thereon into first polarized light and second polarized light with different propagation directions and different polarization states. , the polarization conversion element 11d is configured to convert 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.

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

For example, the polarization conversion element is located on the side of the polarization beam splitting element away from the light source, on the side of the reflection element away from the light source, or between the polarization beam splitting element and the reflection element.

For example, as shown in FIGS. 1A to 1C , the polarization splitting element 11c is configured to receive the collimated light rays collimated by the collimator 11b and reflect the first polarized light rays and transmit the second polarized light rays, and the polarization conversion element 11d is configured In order to receive the second polarized light passing through the polarization splitting element 11c and convert it into a third polarized light, the polarization state of the first polarized light is different from that of the second polarized light, and the polarization state of the third polarized light is different from that of the first polarized light Polarized light has the same polarization state.

For example, the light with a certain divergence angle emitted by the light source 11a is transformed into collimated light after passing through the collimation part 11b; The second adjustment is finally output to the display panel 200 to be converted into image light.

Because the light emitted by the light source 11a has a certain divergence angle, the light with a larger divergence angle (for example, the light with a divergence angle greater than 30 degrees, 45 degrees, 60 degrees or 70 degrees) is difficult to reach the polarization beam splitting element and is difficult to be used for imaging. At least part of the light emitted by the light source 11a may be collimated by setting a collimator to obtain collimated light.

In the embodiment shown in FIG. 1A, FIG. 3A to FIG. 5B of the present disclosure, the first polarized light is S-polarized light, the second polarized light is P-polarized light, and the third polarized light is S-polarized light. example to illustrate. Certainly, in other embodiments, the first polarized light and the third polarized light may be P-polarized light, and the second polarized light may be S-polarized light.

It can be noted that the structure of the light source assembly 11 is not limited to the above description, and light source assemblies 11 with other structures may also be used. For example, the collimated light source assembly 11 that provides collimated light may be replaced by a laser, but is not limited thereto.

As shown in FIG. 1A , a plurality of collimating portions 11 b are disposed inside the lamp tube 10 . For example, the collimating part 11b includes at least one of a total reflection lamp cup and a parabolic reflector lamp cup. For example, a collimating lens can also be further added to the parabolic reflector cup to improve the collimating effect. The schematic diagrams of the collimating part 11 b are shown in FIG. 2A , FIG. 2B and FIG. 2C . The collimating part 11b in the backlight module 100 provided in some embodiments of the present disclosure can adopt the structure shown in Fig. 2A to Fig. 2C, but is not limited thereto, and a suitable collimating part 11b can be selected as required.

For example, as shown in FIG. 1A to FIG. 6B , in the backlight module 100 provided by some embodiments of the present disclosure, in order to improve the utilization rate, the backlight module 100 further includes a reflective element 11e, and the reflective element 11e is configured to receive polarized The light splitting element 11c reflects the first polarized light and adjusts its propagation direction to be the same as the third polarized light.

The purpose of setting the reflective element 11e is to convert the non-polarized light into the same polarized light, and the same polarized light can be fully utilized by the display panel 200 (as shown in FIG. 9 and FIG. 10 ) to avoid waste. For example, the display panel 200 includes a liquid crystal screen.

For example, the reflective element 11e may include at least one of a polarization transflective element, a reflective element, or a polarization conversion element. In the embodiment shown in FIG. 1B and FIGS. 1C-1F , the polarization conversion element 11d may be a 1/2 wave plate. Depending on the position of the polarization conversion element, the properties of the polarization transflective element will also change.

For example, in the light source assembly 11 shown in FIGS. 1D to 1F compared with the light source assembly 11 shown in FIGS. 1B and 1C , the position of the polarization conversion element 11 d is adjusted.

As shown in FIG. 1D , the polarization conversion element 11 d may be located above the reflective element 11 e to convert the polarization state of the light recycled by the reflective element 11 e.

As shown in FIG. 1E , the polarization conversion element 11d may be located between the polarization beam splitting element 11c and the reflection element 11e to convert the polarization state of one beam of light split by the polarization beam splitting element 11c.

Compared with the light source assembly 11 shown in FIG. 1F, the light source assembly 11 shown in FIG. 1F has adjusted the orientation of the polarization conversion element 11d, and the polarization conversion element 11d as shown in FIG. 1F is rotated in its plane. Afterwards, a polarization conversion element 11d as shown in FIG. 1E can be obtained.

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

As shown in FIG. 3A to FIG. 5B , in the backlight module 100 provided by some embodiments of the present disclosure, the diffusion of the collimated light by the diffusion element 121 includes diffusion in the first direction X and diffusion in the second direction Y. At least one, the first direction X intersects the second direction Y, for example, the first direction X is perpendicular to the second direction Y. It should be noted that, in the embodiments of the present disclosure, the light may be diffused only in the first direction X, only in the second direction Y, or diffused in the first direction X and in the second direction Diffusion is performed on both Y. When the diffusion of the diffusion element 121 includes the diffusion in the first direction X and the 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.

For example, the diffusing process of the collimated light by the diffusing element 121 includes: at least one of diffusing in the first direction X and diffusing in the second direction Y.

As shown in FIG. 1A, in the backlight module 100 provided by some embodiments of the present disclosure, the backlight module 100 further includes at least one lamp tube 10, and the lamp tube 10 includes a housing 10a and an inner wall at least surrounded by the housing 10a. The cavity 10b, a plurality of light source assemblies 11 and at least part of the direction control assembly 12 are located in the inner cavity 10b of the at least one lamp tube. 1A, 3A to 5B, the direction control assembly 12 is located above the light source assembly 11, and the direction control assembly 12 is located in the inner cavity 10b. For example, the directional control element 12 may include at least one of a lens, a diffuser film, and a deflection diffuser film.

For example, the backlight module 100 may include one or more lamp tubes 10 . In some embodiments, the backlight module 100 may include two or more lamp tubes 10 . The quantity of lamp tube 10 is determined according to needs.

For example, multiple light tubes may appear for one directional control element. For example, multiple lamp tubes correspond to a deflecting diffuser.

For example, one direction control element can also be provided corresponding to one light tube 10 , so that in the case of setting multiple light tubes, the backlight module includes multiple direction control elements.

For example, as shown in FIG. 1A , 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 to facilitate the formation of larger-sized images.

As shown in FIG. 1A, 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 extending direction of the long side 1002 a of the light outlet 1002 , and the second direction Y is the extending direction of the short side 1002 b 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.

As shown in FIG. 1A, the lamp tube 10 includes a bottom surface 1001, which is opposite to the light outlet 1002. The bottom surface 1001 includes a long side 1001a and a short side 1001b. The first direction X can also be the extending direction of the long side 1001a of the bottom surface 1001. The second direction Y may also be the extending direction of the short side 1001 b of the bottom surface 1001 .

Certainly, in other embodiments, the first direction X and the second direction Y may also be given as references based on other elements.

FIG. 1A also shows a third direction Z, which is perpendicular to the first direction X and perpendicular to the second direction Y. As shown in FIG. That is, the third direction Z is perpendicular to the plane where the first direction X and the second direction Y lie. For example, the third direction Z is a direction perpendicular to the bottom surface 1001 .

In the embodiments of the present disclosure, two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other as an example for illustration.

In the backlight module 100 provided by some embodiments of the present disclosure, the light after direction control by the direction control element at least covers the light outlet 1002 .

For example, the fact that the light covers at least the light outlet 1002 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 ruled out.

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

For example, in some embodiments, the diffusing element 121 includes only a diffusing film and no concave lenses. In other embodiments, the diffusion element 121 only includes a diffusion film and does not include a concave lens. In other embodiments, the diffusion element 121 may include a diffusion film and a concave lens.

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

For example, the diffusing element includes a diffusing 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, at least one of the diffusion film, the plano-concave cylindrical mirror and the linear Fresnel concave lens, and at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens are arranged along the light source Set the light output direction of the light emitted by the component.

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

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

For example, as shown in FIGS. 3A and 3B , the diffusing element includes a first sub-diffuser F1 and a second sub-diffuser F2, and the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, In addition, 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 emit light along the light source assembly to set the light output direction. For example, the plano-convex cylindrical mirrors in FIGS. 3A and 3B can be replaced by linear Fresnel convex lenses.

For example, as shown in FIG. 3C , the diffusing element includes a first sub-diffuser F1 and a second sub-diffuser F2 , and the converging element includes a plano-convex cylindrical lens 303 and a linear Fresnel convex lens 304 . The first sub-diffuser F1, the second sub-diffuser F2, and the plano-convex cylindrical mirror (first sub-converging part C1) 303 and the linear Fresnel convex lens (second sub-converging part C2) ) 304 are sequentially arranged along the light emitting direction of the light emitted by the light source assembly.

For example, in some embodiments, the first sub-diffuser F1, the second sub-diffuser F2, the first sub-convergence C1, and the second sub-convergence C2 When the light emitting directions of the light emitted by the components are set, for example, in sequence, the first sub-diffuser F1 is configured to diffuse the light incident on it in the second direction, and the second sub-diffusion The member F2 is configured to diffuse the light passing through the first sub-diffuser F1 in the first direction, and the first sub-converging member C1 is configured to diffuse the light passing through the second sub-diffuser F2 Convergence is performed in the second direction, and the second sub-convergence member C2 is configured to converge the light passing through the first sub-convergence member C1 in the first direction.

For example, in some embodiments, in the first sub-diffuser F1, the first sub-convergence C1, the second sub-diffusion F2, and the second sub-convergence C2 along the When the light emitting directions of the light emitted by the components are set, for example, in sequence, the first sub-diffuser F1 is configured to diffuse the light incident on it in the second direction, and the first sub-converging The component C1 is configured to converge the light passing through the first sub-diffuser F1 in the second direction, and the second sub-diffuser F2 is configured to converge the light passing through the first sub-converging component C1 Diffusion is performed in the first direction, and the second sub-converging part C2 is configured to converge the light passing through the second sub-diffusing part F2 in the first direction.

For example, the first sub-diffuser F1, the second sub-diffuser F2, and the at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens emit along the light source assembly When the light emitting direction of the light is set, the first sub-diffusion member F1 is configured to diffuse the collimated light in the second direction, and the second sub-diffusion member F2 is configured to diffuse the collimated light The light of the first sub-diffuser F1 is diffused in the first direction, and the plano-convex cylindrical mirror or the linear Fresnel convex lens is configured to control the light passing through the second sub-diffuser F2 in the first direction. The convergence takes place in the direction or in said second direction.

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, and the second sub-diffuser F2 includes a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel lens. At least one of the concave lens, the first sub-converging part C1 includes at least one of a plano-convex cylindrical lens, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens, and the second sub-converging part C2 includes a plano-convex At least one of a cylindrical lens, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.

For example, as shown in FIG. 4A, the diffusing element includes a first sub-diffuser F1 and a second sub-diffuser F2, the converging element includes a first sub-converging C1 and a second sub-converging C2, and the The first sub-diffuser F1 , the first sub-concentrator C1 , the second sub-diffuser F2 , and the second sub-convergence C2 are arranged along the light emitting direction of the light emitted by the light source assembly 11 .

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

For example, the quantitative relationship between the first sub-converging parts and the second sub-converging parts can be that the orthographic projections of a plurality of first sub-converging parts on the X-Y plane correspond to the orthographic projections of a plurality of second sub-converging parts on the X-Y plane , or one first sub-converging part corresponds to multiple second sub-converging parts, or multiple first sub-converging parts correspond to one second sub-converging part. For example, when the first sub-converging part is a plano-convex cylindrical lens, and the second sub-converging part is a one-dimensional Fresnel convex lens, a convex lens or a circular Fresnel lens, a plurality of plano-convex cylindrical mirrors can correspond to a plurality of one-dimensional One-dimensional Fresnel convex lens, corresponding to multiple convex lenses or corresponding to multiple circular Fresnel lenses, or a plano-convex cylindrical lens corresponding to multiple one-dimensional Fresnel convex lenses, corresponding to multiple convex lenses or corresponding to multiple circular A Fresnel lens, or a plurality of plano-convex cylindrical mirrors may correspond to a one-dimensional Fresnel convex lens, correspond to a convex lens, or correspond to a circular Fresnel lens.

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

3A to 5B show side views of a backlight module provided by some embodiments of the present disclosure. In the side views shown in FIGS. 3A to 5B , (a) in the left side is a plan view of the XZ plane, and (b) in the right side is a plan view of the XY plane. In the side views shown in Fig. 3A to Fig. 5B, (a) in the left side also indicates the first direction X with a cross in the circle, indicating a direction perpendicular to the paper, and (b) in the right side ) also shows the second direction Y with a cross in the circle, indicating the direction perpendicular to the paper. 3A to 5B, the first direction X is the extending direction of the long side 1002a of the light outlet 1002, the second direction Y is the extending direction of the short side 1002b of the light outlet 1002, and the third direction Z is the direction perpendicular to the bottom surface 1001. Example to illustrate.

Referring 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 diffusing the light corresponding to the collimated light and then performing the second diffusion. 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.

For example, the collimated light is converged by the converging element after the first diffusion and the second diffusion, or the collimated light is converged by the converging element after the first diffusion and before the second diffusion.

For example, converging is at least partially converging. For example, there is no distinction between the first convergence and the second convergence, or the first convergence and the second convergence or the first convergence when there is a first convergence and a second convergence.

In the backlight module 100 provided in some embodiments of the present disclosure, the converging of the converging element 122 includes first converging and second converging, the first converging is converging the light after the first diffusion and before the second diffusion, and the second converging Converge is to converge the second diffused rays.

For example, the light corresponding to the collimated light is converged by the converging element after the first diffusion and the second diffusion, or the light corresponding to the collimated light is converged by the converging element after the first diffusion and before the second diffusion.

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

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

As shown in FIG. 3A and FIG. 3B , in the backlight module 100 provided by some embodiments of the present disclosure, the diffusing element 121 includes a diffusing film 301 and a flat-convex cylindrical mirror 302 , the converging element 122 includes a plano-convex cylindrical mirror 303 , and the diffusing element 121 includes a flat-convex cylindrical mirror 302 . The 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, a diffusion film 301 , a plano-concave cylindrical mirror 302 , and a plano-convex cylindrical mirror 303 are arranged in sequence.

As shown in FIG. 3A and FIG. 3B , in the backlight module 100 provided by some embodiments of the present disclosure, the diffusion film 301 is configured to diffuse the collimated light in the first direction X, and the plano-concave cylindrical mirror 302 is configured to 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.

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

For example, in the embodiment shown in FIG. 3A and FIG. 3B , in the first direction X, the number of light source assemblies 11 is large, and the distribution length of the light emitted by the plurality of light source assemblies 11 in the first direction X is almost equal to or It is slightly smaller than the length of the lamp tube 10, so the 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 light distribution.

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, but have almost no influence on the light distributed in the first direction X. The plano-concave cylindrical mirror 302 can diffuse and disperse the collimated light, so that the light can cover at least the size of the light outlet 1002 in the second direction Y as much as possible. The plano-convex cylindrical mirror 303 can gather the diffused light and make it emit in a desired direction, and can also avoid the waste of light caused by an excessively large diffusion angle.

For example, as shown in FIG. 3B , the direction control element 12 may also include a deflection diffusion film 300, the deflection diffusion film 300 is arranged on the light emitting direction of the plano-convex cylindrical mirror 303, and the light emitted by the plano-convex cylindrical mirror 303 passes through the After the deflection diffusion film 300 can be deflected and diffused at a certain angle, it can prevent the light output area from being large enough, and can also make the light propagate in the desired direction (for example, toward the display panel), further improving the light utilization rate.

For example, the quantity of the deflection diffusion film 300 can be multiple, and the plurality of polarization diffusion films 300 are arranged along the light emitting direction of the light emitted by the light source assembly 11 (such as the direction of the main optical axis of the light), and each polarization diffusion film 300 is It is configured to propagate light toward a desired direction (for example, toward a display panel).

The backlight module provided by the embodiment shown in FIG. 3A and FIG. 3B of the present disclosure can improve light utilization efficiency by separately controlling light in different directions.

As shown in Fig. 1A, Fig. 3A, Fig. 3B, and Fig. 9, the collimated light rays emitted by multiple light source assemblies 11 are first passed through the direction control element 12 for direction control, so that the collimated light rays can cover the light outlet of the lamp tube 10 as much as possible. 1002, so as to form a long and narrow light-emitting area, and the light finally exits through the light-emitting port 1002 to the liquid crystal screen with the same area as the light-emitting port 1002, so as to form the eye box area corresponding to the long and narrow imaging area, and the long and narrow imaging area can be used by the driver Watch at the same time as other passengers.

In the backlight module 100 provided in some embodiments of the present disclosure, the diffusing element 121 includes a first plano-concave cylindrical mirror 401 and a second plano-concave cylindrical mirror 402, and the converging element 122 includes a first plano-convex cylindrical mirror 40a and a first plano-convex cylindrical mirror 40a. The second plano-convex cylindrical mirror 40b, and the first plano-convex cylindrical mirror 401, the first plano-convex cylindrical mirror 40a, the second plano-convex cylindrical mirror 402, and the second plano-convex cylindrical mirror 40b along the light source The output direction of the light emitted by the component 11 (for example, the direction of the main optical axis of the light) is set. For example, the first plano-concave cylindrical mirror 401 , the first plano-convex cylindrical mirror 40 a , the second plano-concave cylindrical mirror 402 , and the second plano-convex cylindrical mirror 40 b are arranged in sequence.

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, and 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, and the second plano-concave cylindrical mirror 402 is configured to converge the light passing through the first plano-convex cylindrical mirror 40a in the first direction X Diffusion is performed, 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.

For example, as shown in FIG. 4A and FIG. 4B, 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, while the light rays in the first direction X are almost No effect. The first plano-concave cylindrical mirror 401 can diffuse the collimated light so that it can spread out, so that the light can cover the size of the light outlet 1002 as far as possible in the second direction Y; the first plano-convex cylindrical mirror 40a can The diffused light is gathered to make it emit in the desired direction, which can also avoid the waste of light caused by excessive diffusion angle. For example, desired directions include the principal optical axis direction, but are not limited thereto.

For example, as shown in FIG. 4A and FIG. 4B , 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, while the light distributed in the second direction Y is almost No effect. The plano-concave cylindrical mirror can diffuse the collimated light to disperse it, so that the light can cover the size of the light outlet 1002 as far as possible in the first direction X; the plano-convex cylindrical mirror can gather the diffused light , so that it emits in the desired direction, and can also avoid the waste of light caused by excessive diffusion angle.

For example, as shown in FIG. 4B, the direction control element 12 also includes a deflection diffusion film 400, and the deflection diffusion film 400 is arranged on the light-emitting direction of the second plano-convex cylindrical mirror 40b, and is emitted through the second plano-convex cylindrical mirror 40b. After the light passes through the deflection and diffusion film 400, it can be deflected and diffused at a certain angle, so that the light can propagate toward a desired direction (for example, toward a display panel), thereby further improving light utilization efficiency.

For example, the quantity of the deflection diffusion film 400 can be multiple, and the plurality of polarization diffusion films 400 are arranged along the light emitting direction of the light emitted by the light source assembly 11 (such as the direction of the main optical axis of the light), and each polarization diffusion film 400 is It is configured to propagate light toward a desired direction (for example, toward a display panel).

In the backlight module provided by the embodiment shown in FIG. 4A and FIG. 4B of the present disclosure, the controllability of the light is improved by separately controlling the light in different directions.

In the backlight module 100 provided in some embodiments of the present disclosure, the diffusing element 121 includes a first plano-concave cylindrical mirror 501 and a second plano-concave cylindrical mirror 502, and 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 of the light emitted by the light source assembly 11 (eg, the direction of the main optical axis of the light). For example, a first plano-concave cylindrical mirror 501 , a second plano-concave cylindrical mirror 502 , and a convex lens 503 are arranged in sequence.

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, and the second plano-concave cylindrical mirror 502 is configured to The light passing through the first plano-concave cylindrical mirror 501 is diffused in the first direction X, and the convex lens 503 is configured so that the light passing through the second plano-concave cylindrical mirror 502 is diffused in the first direction X and the second direction Y. converge.

As shown in FIG. 5B , in the backlight module 100 provided by some embodiments of the present disclosure, the direction control element 12 further includes a deflection diffusion film 500 , and the deflection diffusion film 500 is arranged in the light emitting direction of the converging element 122 , and the deflection The diffusion film 500 is configured to deflect and diffuse the light passing through the converging element 122 .

For example, the deflection and diffusion film 500 is arranged on the light emitting direction of the convex lens 503, and the light emitted by the convex lens 503 can be deflected and diffused at a certain angle after passing through the deflection and diffusion film 500, so that the light can propagate toward the desired direction (for example, towards the display panel) directional propagation) to further improve light utilization.

For example, the quantity of the deflection diffusion film 500 can be multiple, and the plurality of polarization diffusion films 500 are arranged along the light-emitting direction of the light emitted by the light source assembly 11 (for example, the direction of the main optical axis of the light), and each polarization diffusion film 500 is It is configured to propagate light toward a desired direction (for example, toward a display panel).

For example, as shown in FIG. 5A and FIG. 5B , the first plano-concave cylindrical mirror 501 is used to control the light distributed in the second direction Y, and has almost no influence on the light distributed in the first direction X. The first plano-concave cylindrical mirror 501 can diffuse and disperse the collimated light, so that the light can cover the size of the light outlet 1002 as far as possible in the second direction Y.

For example, as shown in FIG. 5A and FIG. 5B , the second plano-concave cylindrical mirror 502 is used to control the light distributed in the first direction X, and has almost no influence on the light distributed in the second direction Y. The plano-concave cylindrical mirror can diffuse and disperse the collimated light, so that the light can cover the size of the light outlet 1002 as much as possible in the first direction X.

For example, as shown in Figure 5A and Figure 5B, the convex lens can gather the light diffused in the first X direction and the second direction Y, so that it can be emitted toward the desired direction, and can also avoid the light caused by excessive diffusion angle. waste.

The backlight module provided by the embodiment shown in FIG. 5A and FIG. 5B of the present disclosure improves the controllability of the light by separately controlling the light in different directions.

Figures 3A to 5B show the embodiments of using different direction control elements in the present disclosure. It should be noted that the process of direction control involved in Figures 3A to 5B is: first diffuse, then converge, and first diffuse The function is to diffuse the collimated light to cover the light outlet 1002, and the function of convergence is to converge the light to the desired direction, so as to avoid wasting light due to the excessively large diffusion angle of the light.

In the above-mentioned embodiments, at least one of a diffusion film and a lens may be used as a way to diffuse light. For example, the diffusion film can be a one-dimensional diffusion film or a two-dimensional diffusion film. In the case of a one-dimensional diffusion film, the controllability of light can be improved. The lens can be a one-dimensional lens or a two-dimensional lens. In the case of a one-dimensional lens, the controllability of light can be improved.

In the embodiments of the present disclosure, one-dimensional means in one direction, for example, on a line, and two-dimensional means in two directions, for example, on a plane.

For example, a one-dimensional direction may refer to the first direction X or the second direction Y, for example, one-dimensional diffusion refers to the diffusion in the first direction X or the second direction Y. A one-dimensional diffusing element refers to an element capable of diffusing light in the first direction X or the second direction Y.

For example, a one-dimensional converging element refers to an element that condenses light in the first direction X or the second direction Y, and the one-dimensional converging element includes a one-dimensional converging lens.

For example, a two-dimensional converging element refers to an element that condenses light in a first direction X and a second direction Y, and the two-dimensional converging element includes a two-dimensional converging lens.

In the above embodiments, a lens can 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.

For example, the lamp tube 10 also has a converging effect. When the divergence angles of multiple collimated light source assemblies 11 adjusted by the direction control element 12 are still large, the lamp tube 10 can further regulate the convergence of the light. At present, in the example of FIG. 1A , the side surface of the lamp tube 10 is an inclined plane, and the light is converged after being reflected by the inclined plane. In other examples, the side surface of the lamp tube 10 can also be set as the Parabolic.

For example, the shape of the lamp tube 10 may also be a paraboloid.

For example, the lamp tube 10 can be a total reflection lamp tube (at least part of the light emitted by the light source 11a will be totally reflected on the surface when it enters the inner cavity of the lamp tube 10), or the inner cavity of the lamp tube 10 can be provided with a reflective layer (such as A reflective layer is formed on the inner wall of the lamp tube 10 by aluminum plating).

For example, the arrangement of the collimating parts 11b in the lamp tube 10 may be as shown in FIG. 1A . However, the arrangement of the collimating parts 11b is not limited to that shown in FIG. 1A . In other embodiments, a plurality of collimating portions 11b may be arranged in an array on the bottom surface 1001 of the lamp tube 10 .

As shown in FIG. 6A and FIG. 6B , in the backlight module 100 provided in some embodiments of the present disclosure, the backlight module 100 further includes a sensor 800 configured to detect external light incident thereon and emit Signal.

As shown in FIG. 6B , in the backlight module 100 provided in some embodiments of the present disclosure, the plurality of light source assemblies 11 includes a plurality of first light source assemblies 1101 and a plurality of second light source assemblies 1102 , and the plurality of first light source assemblies 1101 The plurality of second light source assemblies 1102 are arranged axisymmetrically with respect to the symmetry axis A0 and are respectively located on both sides of the symmetry axis A0 . The sensor 800 is located between the plurality of first light source assemblies 11 and the plurality of second light source assemblies 11 . As shown in FIGS. 6A and 6B , the axis of symmetry A0 extends in the third direction Z. As shown in FIG.

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 overlaps with the sensor 800 at least partially, and the overlapped at least part can transmit external light.

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 part of the light source assembly 11 is located directly above the sensor 800, and the part of the light source assembly 11 located directly above the sensor 800 is transparent. over infrared light.

As shown in Fig. 6A and Fig. 6B, 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 sends out a warning or triggers a defense to prevent screen burn-in . For example, the ambient light signal includes at least one of intensity and temperature of light.

As shown in Figure 6B, the reflective elements 11e adopt a symmetrical arrangement, so that there is a larger area where the sensor 800 can be installed; correspondingly, the two reflective elements directly above the sensor 800 have infrared transmission characteristics, so as to avoid affecting the sensor. 800 performance.

As shown in Figure 1B, Figure 1C, Figure 6A and Figure 6B, the arrangement of multiple light source assemblies 11 can be shown in Figure 1B and Figure 6A, a plurality of light source assemblies 11 are arranged in sequence, and the multiple light source assemblies 11 The placement is consistent. The arrangement of the multiple light source assemblies 11 can be shown in FIG. 1C and FIG. 6B , the multiple light source assemblies 11 are arranged sequentially, and the multiple light source assemblies 11 are arranged axisymmetrically with respect to the axis of symmetry A0 .

Compared with FIG. 3A , the convex surface of the converging element 122 in FIG. 7A is downward, that is, the converging element 122 in FIG. 3A is vertically turned over.

Compared with FIG. 3A , the concave surface of the second sub-diffuser F2 in FIG. 7C is downward, that is, the second sub-diffuser F2 is vertically turned over.

Compared with FIG. 3A , the concave surface of the second sub-diffuser F2 in FIG. 7C is downward, that is, the second sub-diffuser F2 is vertically turned over, and the upper surface of the second sub-diffuser F2 and the lower surface of the converging element 122 Surface-mounted (i.e., no space between two elements), thereby eliminating glare or ghosting caused by light reflecting between the two elements.

Compared with FIG. 4A , the concave surface of the second sub-diffuser F2 in FIG. 7D faces downward.

Compared with Fig. 4A, the concave surface of the second sub-diffuser F2 in Fig. 7E is facing downward, and the second sub-converging part C2 is attached to the second sub-diffuser F2 (that is, there is no space between the two elements), thereby eliminating Glare or ghosting caused by light reflecting between two elements.

Compared with FIG. 7E , the concave surface of the first sub-diffuser F1 in FIG. 7F faces downward.

Compared to Fig. 7F, in Fig. 7G the first sub-converging member C1 is bonded to the first sub-diffusing member F1 (i.e. there is no space between the two elements), thereby eliminating the glare caused by light reflected between the two elements or ghosting.

Compared with FIG. 4A , in FIG. 7H the concave surface of the first sub-diffuser F1 faces downward, and the concave surface of the second sub-diffuser F2 faces downward.

Compared with FIG. 4A , the concave surface of the first sub-diffuser F1 in FIG. 7I faces downward.

In the embodiments of the present disclosure, the orientation of the concave surface of the diffusing element (sub-diffuser) or the convex surface of the converging element (sub-converging element) is not limited, and can be set as needed. In other drawings, it can also be set as needed. Adjustment of concave or convex orientation.

Fig. 8 is a schematic diagram of a light tube in a backlight module provided by some embodiments of the present disclosure. In the backlight module 100 provided by some embodiments of the present disclosure, as shown in FIG. 8 , a reflective surface RF is provided on the inner wall 10c of the casing 10a to adjust the direction of the light irradiated on the reflective surface so that Emit towards the light outlet 1002. FIG. 8 shows the side 1003 of the light cylinder 10 . Figures 1A, 3A-5B also show the side 1004 of the light barrel. The inner wall of at least one of the bottom surface 1001 , the side surface 1003 , and the side surface 1004 is provided with a reflective surface RF.

As shown in FIG. 9 and FIG. 10 , some embodiments of the present disclosure further provide a head-up display device, including a display panel 200 and any one of the above-mentioned backlight modules 100 .

In some embodiments of the present disclosure, the emitted light is emitted toward the display panel 200 . FIG. 1A , FIGS. 3A to 5B , FIG. 9 , and FIG. 10 show outgoing light L0 . The outgoing light L0 is emitted from the backlight module to the display panel 200 .

9 and 10 schematically show the arrangement of the backlight module in the inner cavity of the lamp tube. FIG. 9 shows two light source assemblies 11 and the direction control elements 12 above them, not all the light source assemblies 11 and the direction control elements 12 are shown. FIG. 10 shows a light source assembly 11 and a direction control element 12 located above it, but not all light source assemblies 11 and direction control elements 12 are shown.

As shown in FIG. 11 and FIG. 12 , the backlight module further includes at least one uniform light element 13 , and at least one uniform light element 13 is disposed on a side of the direction control element 122 away from the light source assembly 11 . Alternatively, at least one uniform light element 13 is disposed on a side of the direction control element 122 away from the diffusion element 121 .

A dodging element 13 (as shown in FIG. 11 ) can also be arranged between the direction control element 122 and the display panel 200 to improve the uniformity of the light. The dodging element 13 can be located in the lamp tube 10 or in the display panel. 200 (as shown in Figure 12). For example, the uniform light element 13 includes a diffuser. The embodiment of the present disclosure does not limit the location of the uniform light element 13 , as long as it can have a uniform light effect on the light.

Some embodiments of the present disclosure also provide a head-up display device, including a display panel 200 and any one of the backlight modules 100 described above. The display panel 200 is located at the light outlet 1002 of the lamp tube 10 . The area is basically the same.

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-right direction of the transflective element. For example, the transflective element includes a curved mirror, but is not limited thereto. A transflective element may also be called a reflective imaging portion.

For example, after the collimated light first passes through the direction control element 12 (not shown in FIG. 1A , refer to FIGS. 3A to 5B ) for direction control, the collimated light can at least cover the light outlet 1002 of the lamp tube 10 as far as possible, thereby forming In the narrow and long light emitting area, the light finally exits through the light exit 1002 to the liquid crystal screen with the same area as the light exit 1002 to form a long and narrow imaging area, which can be watched by the driver and other passengers at the same time. The embodiments of the present disclosure do not limit the area of the liquid crystal screen, which may be the same as or different from the area of the light outlet 1002, and may be set as required.

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.

For example, in some embodiments of the present disclosure, the polarization conversion element 11d is located above the collimating portion 11b and has an included angle with the bottom surface 1001 of the lamp tube 10 . For example, the polarization splitting element 11 c is located above the collimating portion 11 b and has an included angle with the bottom surface 1001 of the lamp tube 10 . For example, the reflective element 11 e is located above the collimating portion 11 b and has an included 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 reflection element 11e are all inclined relative to the bottom surface 1001 of the lamp tube 10 .

Some embodiments of the present disclosure also provide a vehicle, including any one of the above-mentioned head-up display devices.

For example, vehicles include, but are not limited to, automobiles.

FIG. 13 is a schematic diagram of an optical path of a HUD device included in a vehicle. As shown in FIG. 13 , 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 may also be referred to as a reflective portion. The transflective element 03 can also be called a reflective imaging part.

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

For example, in some embodiments, after the collimated light is processed by the direction control component, the divergence angle in the first direction is θ1, the divergence angle in the second direction is θ2, and the length of the eye box area in the horizontal direction is h , the length in the vertical direction is h', θ1≤arctanh/2D, θ2≤arctan h'/2D, D is the propagation path length of the outgoing light of the backlight module from the backlight module to the eye box area.

The divergence angle is currently a more general standard for measuring the light beam angle. For example, the divergence angle is θ, and θ/2 is the angle between the light-emitting direction and the optical axis when the luminous intensity value is half of the axial intensity value; or, θ/ 2 may also be the angle between the light emitting direction and the optical axis when the luminous intensity value is 60% or 80% of the radial intensity value.

For example, the eye box area 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 eye box area extends horizontally, and the short side of the eye box area extends vertically.

For example, D=d1+d2+d3, d1 is the distance between the backlight module and the reflective element 02, d2 is the distance between the reflective element 02 and the transflective element 03, d3 is the distance between the transflective element 03 and the eye box EB0 distance between. In some embodiments, d1 may be the distance between the center of the backlight module and the center of the reflective element 02, d2 may be the distance between the center of the reflective element 02 and the center of the transflective element 03, and d3 may be the distance between the center of the transflective element 03 The distance between the center and the center of the eyebox EB0.

The embodiment shown in FIG. 13 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 the head-up display device, and the transflective element may include a curved mirror.

The collimating part in the backlight module may adopt the structure described above, or may adopt the structure described below.

As shown in FIG. 14A , in some embodiments, the collimating portion 11 b includes at least one collimating element 4 . At least one collimator 4 is located on the collimation layer. The backlight module 10 includes a plurality of light source assemblies 11 located on the light source layer. The area between the light source layer and the collimation layer is at least a continuous gas medium layer. For example, the gas medium layer is adjacent to the collimation layer and the light source layer, and the gas medium layer may be air. For example, no oblique or vertical reflectors are provided between adjacent light source components.

As shown in FIGS. 14A to 16B , in some embodiments, the collimating part includes at least one collimating element 4 . As shown in Fig. 14B, Fig. 15B and Fig. 16B, at least one collimating element 4 is located on the collimating layer, the backlight module 10 includes a plurality of light source assemblies 11, and the plurality of light source assemblies 11 are located on the light source layer, between the light source layer and the collimating layer The intervening area is at least a continuous gas medium layer. Therefore, at least part of the light source assembly 11 may not be provided with a reflective cup, thereby facilitating heat dissipation of the light source assembly. For example, as shown in FIG. 14B and FIG. 15B , the gas medium layer is adjacent to the collimation layer and the light source layer, so that the light emitted by the light source assembly 11 is directly incident on the collimator 4 after passing through the gas medium layer; or , as shown in FIG. 16B , the gas medium layer is adjacent to the light concentrating layer and the collimation layer including a plurality of transparent light concentrating parts 123, so that the light emitted by the light source assembly 11 passes through the transparent light concentrating parts 123 and the gas medium layer Then directly incident on the collimator 4. For example, the gas medium layer can be air or other gases.

The collimator 4 includes a first convex surface 41 and a second convex surface 42. Optionally, the first convex surface 41 and the second convex surface 42 are oppositely arranged, the first convex surface 41 is a convex surface facing the light source assembly 11, and the second convex surface 42 is facing away from The convex surface in the direction of the light source assembly 11. At least part of the light emitted by the light source assembly 11 enters the collimator 4 through the first convex surface 41 and exits through the second convex surface 42 . The collimator 4 is configured such that the divergence angle of the light emitted from the second convex surface 42 is smaller than the divergence angle of the light incident from the first convex surface 41 . Optionally, the center of the collimator 4 is collimated with the center of the corresponding light source assembly 11 .

For example, the collimator 4 is a convex lens or a Fresnel lens, and the collimator 4 can reduce the divergence angle of the passing light. Optionally, the light emitted by the light source assembly 11 enters the collimator 4, the light is emitted after being collimated by the collimator 4, and the collimated light enters the light converging part 122.

For example, as shown in FIG. 14B , it is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in FIG. 14A .

As shown in FIG. 15A , in some embodiments, the collimator 4 includes a first convex surface 41 and a second convex surface 42 , the first convex surface 41 is located in the middle of one end of the collimator 4 close to the light source assembly 11 , and the second convex surface 42 It is located in the middle of the end of the collimator 4 away from the light source assembly 11 . The collimator 4 also includes a sub-light-incident surface 43 , a sub-light-exit surface 44 and a side surface 45 . The sub-light incident surface 43 is located at the edge of the first convex surface 41 , and one edge of the sub-light incident surface 43 is connected to the edge of the first convex surface 41 . The sub-light-emitting surface 44 is located at the edge of the second convex surface 42 , and the edge of one end of the sub-light-emitting surface 44 is connected to the edge of the second convex surface 42 . One end of the side surface 45 is connected to the sub-light incident surface 43 , and the other end is connected to the sub-light-emitting surface 44 . For example, the sub-light incident surface 43 is a curved surface, the sub-light-emitting surface 44 is a plane, and the side surface 45 is a curved surface or a paraboloid. The first convex surface 41 , the second convex surface 42 , the sub-light incident surface 43 , the sub-light exit surface 44 , and the side surface 45 constitute the closed outer surface of the collimator 4 .

Part of the light emitted by the light source assembly 11 enters the collimator 4 through the first convex surface 41 , and another part of the light emitted by the light source assembly 11 enters the collimator 4 through the sub-light incident surface 43 . Part of the light entering the collimator 4 is reflected by the side surface 45 and emitted from the sub-light-emitting surface 44, thereby improving the uniformity of the light at the light-emitting surface of the collimator 4 (the upper surface of the collimator 4 in FIG. 15A ), and further enabling Eliminate the problems of uneven light on the light-emitting surface and large brightness differences in some areas of the light-emitting surface (for example, the area on the light-emitting surface becomes a black ring area due to less outgoing light in some areas).

Optionally, the sub-light incident surface 43 is arranged around the first convex surface 41 and is at least partially plane. The sub-light-emitting surface 44 is disposed around the second convex surface 42 , and the sub-light-incident surface 43 and the first convex surface 41 define a light receiving cavity opening toward the light source assembly.

In some embodiments, the collimator 11b includes a collimator, and the collimator includes a plurality of lenses to form a lens combination, for example, a combination of a convex lens and a concave lens, a combination of a Fresnel lens and a concave lens, and the like. The collimation element is configured such that the divergence angle of the light rays exiting the collimation element is smaller than the divergence angle of the light rays entering the collimation element. For example, the light emitted by the light source assembly 11 enters the collimator, and the divergence angle of the light becomes smaller after passing through a combination of multiple lenses. Through the combination of multiple lenses, the outgoing direction of the light passing through the collimator can be more accurately adjusted to a preset angle range.

For example, as shown in FIG. 15B , it is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in FIG. 15A .

In some embodiments, the collimating element includes a collimating film, and the collimating element is configured such that the divergence angle of the light rays exiting the collimating element is smaller than the divergence angle of the light rays entering the collimating element. For example, the collimator is a BEF film (Brightness Enhancement Film, Brightness Enhancement Film), which is used to adjust the outgoing direction of the light to a preset angle range, for example, to gather the light in the angle range of ±35° from the normal of the collimation film Inside. The use of the collimating film can reduce the volume of the collimating element, and the structure is compact.

As shown in FIG. 16 , on the basis of the above-mentioned embodiments, the direction control assembly 12 further includes a transparent light concentrating portion 123 disposed between the light source assembly 11 and the collimator 4 . For example, the transparent light collecting part 123 includes a convex lens. The transparent light concentrating part 123 is configured such that the divergence angle of the light exiting the transparent light concentrating part 123 is smaller than the divergence angle of the light entering the transparent light concentrating part 123 . The light emitted by the light source assembly 11 corresponding to the transparent light concentrating part 123 passes through the collimator 4 after passing through the transparent light concentrating part 123. The multiple transparent light concentrating parts 123 are located in the light concentrating layer, and the gas medium layer is located in the Between the collimating layer and the light concentrating layer.

For example, as shown in FIG. 16B , it is a schematic diagram of a plurality of light source assemblies and light source assembly collimators arranged side by side in FIG. 16A .

As shown in FIG. 17 and FIG. 18 , the light-emitting surface of the transparent light-condensing portion 123 includes at least a first light-emitting curved surface, and the light source assembly 11 can be arranged at the focal point of the first light-emitting curved surface of the transparent light-condensing portion 123 . The light source assembly 11 may be disposed inside the transparent light-gathering portion 123 , for example, the light source assembly 11 is embedded in the transparent light-gathering portion 123 and located in the middle of the lower surface of the transparent light-gathering portion 123 . The transparent light collecting part 123 may be a plano-convex lens with a plane and a convex surface, for example, its lower surface is a plane attached to the substrate, and its upper surface is a convex surface along the light emitting direction of the light source assembly 11 . The transparent light collecting part 123 is located in the light emitting direction of the light source assembly 11 . The transparent concentrating part 123 is configured to converge the light emitted by the light source assembly 11 to obtain the first converged light, and emit the first converged light to the collimator 4, and the collimator 4 is configured to further process the incident first converged light The second converged light is obtained by converging, and the second converged light is incident to the light converging portion 122 . Converging the light emitted by the light source assembly 11 through the transparent light collecting part 123 and the collimator 4 can further improve the utilization rate of the light emitted by the light source assembly.

Optionally, the transparent light collecting part 123 has a groove for accommodating the corresponding light source assembly 11 .

For example, some embodiments of the present disclosure provide a backlight module 100. The backlight module 100 includes a plurality of light source assemblies 11 and a collimator 11b as described above, and the light emitted by the plurality of light source assemblies 11 passes through the collimator 11b. , wherein the collimating part 11b includes at least one collimating element, at least one collimating element is located in the collimating layer, a plurality of light source components 11 are located in the light source layer, and the area between the light source layer and the collimating layer is at least a continuous gas medium layer .

For example, in the collimation part in Fig. 14A-Fig. 16B, since the light source assembly 11 does not have a reflector cup, it can facilitate the heat dissipation of the light source assembly 11, improve the life of the backlight module, improve the uniformity of the light, and improve the image quality.

An embodiment of the present disclosure also provides a backlight module, the collimating part includes at least one collimating part, the at least one collimating part is located in the collimating layer, the plurality of light source components are located in the light source layer, and the light source layer and The area between the alignment layers is at least a continuous gas medium layer.

For example, the gas medium layer is adjacent to the collimating layer and the light concentrating layer; and/or, the transparent light concentrating part has a groove for accommodating a corresponding light source component; and/or, the transparent concentrating The light part is attached to the corresponding light source component; and/or, the light-emitting surface of the transparent light-gathering part is a convex surface that protrudes away from the corresponding light source component; and/or, the transparent light-gathering part is a plano-convex lens .

For example, the light emitted by the light source assembly enters the transparent light collecting part, the light emitted by the transparent light collecting part enters the collimator, and the transparent light collecting part is configured to emit the transparent The divergence angle of the light in the light collecting part is smaller than the divergence angle of the light entering the transparent light collecting part.

For example, the light-emitting surface of the transparent light-gathering portion includes at least a first light-emitting curved surface, and the light source assembly is embedded inside the transparent light-gathering portion and is located at the focal point of the first light-emitting curved surface.

An embodiment of the present disclosure provides a backlight module, including a plurality of light source components and a collimator, and the light emitted by the plurality of light source components passes through the collimator, wherein the collimator includes at least one collimator The at least one collimator is located on the collimation layer, the plurality of light source components are located on the light source layer, and the area between the light source layer and the collimation layer is at least a continuous gas medium layer.

An embodiment of the present disclosure provides a backlight module, including a light source part having a plurality of light source components and a collimating part, the light emitted by the multiple light source components passes through the collimating part, wherein at least part of the multiple light source components Each of the light source assemblies does not include a reflector for reflecting light emitted by the light source assembly.

For example, the light emitted from the transparent light concentrating part is directly incident on the collimation part; and/or, the transparent light concentrating part has a groove for accommodating a corresponding light source component; and/or, the transparent light concentrating and/or, the light-emitting surface of the transparent light-gathering portion is a convex surface that protrudes away from the corresponding light source module; and/or, the transparent light-gathering portion is a plano-convex lens.

The above is only a specific implementation of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope of the present disclosure. should fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims

A backlight module, comprising:

a plurality of light source assemblies configured to provide collimated light; and

a direction control component, the direction control component is located on the light output side of at least one of the plurality of light source components, and the direction control component includes a diffusing element and a converging element;

The collimated light is diffused by the diffusing element to increase the light emitting area, and converged by the converging element to adjust the direction of the outgoing light.
The backlight module according to claim 1, wherein the diffusion of the diffusion element includes at least one of diffusion in a first direction and diffusion in a second direction, the first direction and the second direction intersect.
The backlight module according to claim 1 or 2, further comprising at least one lamp tube, wherein the lamp tube comprises a casing and an inner cavity at least surrounded by the casing, the plurality of light source assemblies and at least one A portion of the directional control assembly is located within the interior cavity of the at least one light tube.
The backlight module according to claim 3, wherein 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, and the light outlet 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.
The backlight module according to claim 4, wherein the collimated light at least covers the light outlet after being directed by the direction control component.
The backlight module according to any one of claims 3-5, wherein the inner wall of the housing is provided with a reflective surface to adjust the direction of the light irradiated on the reflective surface so that it is directed towards the lamp tube The light outlet is emitted, and/or the lamp tube is a parabolic shape.
The backlight module according to any one of claims 1-6, wherein the diffusing element comprises a one-dimensional diffusing element, the converging element comprises a one-dimensional converging lens and/or a two-dimensional converging lens, and/or

The diffusion element performs first diffusion and then second diffusion on the light corresponding to the collimated light, the first diffusion is one of diffusion in the first direction and diffusion in the second direction, the the second diffusion is the other of diffusion in said first direction and diffusion in said second direction, and/or

The diffusing element includes a diffusing film and includes at least one of a plano-concave cylindrical mirror and a linear Fresnel concave lens, the converging element includes at least one of a plano-convex cylindrical mirror and a linear Fresnel convex lens, the diffusing film, the At least one of the plano-concave cylindrical mirror and the linear Fresnel concave lens, 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 set up.
The backlight module according to claim 7, wherein the one-dimensional diffusing element comprises at least one of a plano-concave cylindrical mirror, a diffusing film, and a linear Fresnel concave lens, and the one-dimensional converging element comprises a plano-convex cylindrical mirror , at least one of a linear Fresnel convex lens, the two-dimensional converging lens includes at least one of a convex lens, a circular Fresnel lens, and/or

The converging of the converging element includes first converging and second converging, the first converging is converging the light after the first diffusion and before the second diffusing, and the second converging is converging the first ii) converge the diffused rays, and/or

The light corresponding to the collimated light is converged by the converging element after undergoing the first diffusion and the second diffusion, or the light corresponding to the collimated light is converged by the first diffusion and then The second diffusion is converged by the converging element before.
The backlight module according to claim 7, wherein the diffusion film is configured to diffuse the collimated light in a first direction, and the plano-concave cylindrical mirror and the linear concave Fresnel lens are at least One of them 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 Fresnel convex lens is configured to diffuse the light passing through the plano-concave cylindrical surface. Light rays of at least one of the mirror and the linear concave Fresnel lens converge in the second direction.
The backlight module according to any one of claims 1-9, wherein the diffusing element comprises a first sub-diffusing element and a second sub-diffusing element, and the converging element comprises a first sub-converging element and a second sub-converging element , and the first sub-diffusion piece, the second sub-diffusion piece, the first sub-convergence piece, and the second sub-convergence piece are arranged along the light emitting direction of the light emitted by the light source assembly ;or

The diffusing element includes a first sub-diffuser and a second sub-diffuser, the converging element includes a first sub-converging and a second sub-converging, and the first sub-diffusing, the first sub-converging The member, the second sub-diffusion member, and the second sub-convergence member are arranged along the light emitting direction of the light emitted by the light source assembly; or

The diffusing element includes a first sub-diffuser and a second sub-diffuser, the converging element includes at least one of a plano-convex cylindrical lens and a linear Fresnel convex lens, and the first sub-diffuser, the 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 backlight module according to claim 10, wherein,

In the case where the first sub-diffuser, the second sub-diffuser, the first sub-convergence, and the second sub-convergence 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, and the second sub-diffuser is configured to diffuse the light passing through the first sub-diffuser in the second direction. Diffusion is performed in the first direction, the first sub-converging member is configured to converge light passing through the second sub-diffusing member in the second direction, and the second sub-converging member is configured for converging the light passing through the first sub-converging member in the first direction; or

In the case where the first sub-diffuser, the first sub-convergence, the second sub-diffusion, and the second sub-convergence are arranged along the light emitting direction of the light emitted by the light source assembly , the first sub-diffusion member is configured to diffuse the light incident thereon in the second direction, and the first sub-convergence member is configured to diffuse the light passing through the first sub-diffusion member in the second direction. Converging in the second direction, the second sub-diffuser is configured to diffuse the light passing through the first sub-converging in the first direction, and the second sub-converging is configured converging the light passing through the second sub-diffuser in the first direction;

Wherein, at least one of the first sub-diffuser, the second sub-diffuser, and the plano-convex cylindrical mirror and the linear Fresnel convex lens is emitted along the light source assembly When the light emitting direction of the light is set, the first sub-diffusion member is configured to diffuse the collimated light in the second direction, and the second sub-diffusion member is configured to diffuse the collimated light in the second direction. The light of the sub-diffuser is diffused in a first direction, and the at least one of the plano-convex cylindrical mirror and the linear Fresnel convex lens is configured to control the light passing through the second sub-diffuser. Convergence is performed in the first direction or in the second direction.
The backlight module according to claim 10 or 11, wherein the first sub-diffuser includes at least one of a plano-concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens, and the second sub-diffuser includes a flat At least one of a concave cylindrical mirror, a diffusion film, and a linear Fresnel concave lens, and the first sub-converging member 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-converging element includes at least one of a plano-convex cylindrical lens, a linear Fresnel convex lens, a convex lens, and a circular Fresnel lens.
The backlight module according to any one of claims 1-12, wherein the direction control element further comprises a deflection diffusion film, the deflection diffusion film is arranged in the light emitting direction of the converging element, and the deflection the diffusing film is configured to deflect and diffuse light passing through the converging element, and/or

The light source assembly includes a light source configured to emit light and a collimator configured to collimate at least a portion of the light emitted by the light source.
The backlight module according to claim 13, wherein the collimating part comprises at least one collimating part, the at least one collimating part is located in the collimating layer, the plurality of light source components are located in the light source layer, and the light source The region between the layer and the collimating layer is at least a continuous layer of gaseous medium.
The backlight module according to claim 14, wherein the gas medium layer is adjacent to the collimation layer and the light source layer; or,

The direction control assembly further includes a plurality of transparent light-gathering parts, the light emitted by the light source assembly corresponding to the transparent light-gathering parts passes through the collimation part after passing through the transparent light-gathering parts, and the plurality of transparent light-gathering parts A transparent light-gathering part is located in the light-gathering layer, and the gas medium layer is located between the collimating layer and the light-gathering layer.
The backlight module according to claim 15, wherein the gas medium layer is adjacent to the collimating layer and the light concentrating layer; and/or,

The transparent light collecting part has a groove for accommodating a corresponding light source component; and/or,

The transparent light-gathering part is bonded to the corresponding light source component; and/or,

The light-emitting surface of the transparent light-collecting part is a convex surface that protrudes away from the corresponding light source component; and/or,

The transparent light collecting part is a plano-convex lens.
The backlight module according to any one of claims 14-16, wherein the collimating part comprises at least one collimating part, the collimating part comprises a first convex surface and a second convex surface, and the light emitted by the light source assembly At least part of the light enters the collimator from the first convex surface and exits from the second convex surface, and the collimator is configured such that the divergence angle of the light emitted from the second convex surface is smaller than that from the first convex surface. The divergence angle of rays incident on a convex surface.
The backlight module according to claim 17, wherein the collimator further comprises:

A sub-light incident surface, located at the edge of the first convex surface;

The sub-light-emitting surface is located at the edge of the second convex surface;

The side surface connects the sub-light-incident surface and the sub-light-exit surface. Part of the light emitted by the light source assembly enters the collimator through the sub-light-incident surface, and part of the light entering the collimator passes through the After being reflected by the side surface, it is emitted from the sub-light-emitting surface.
The backlight module according to claim 18, wherein, the sub-light incident surface is arranged around the first convex surface and is at least partially flat; and/or, the sub-light-emitting surface is arranged around the second convex surface, so The sub-light incident surface and the first convex surface define a light receiving cavity opening toward the light source assembly.
The backlight module according to any one of claims 1-19, wherein the light source assembly includes a polarization splitting element and a polarization conversion element, and the polarization splitting element is configured to split the light irradiated thereon into The first polarized light and the 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 and the polarization state of the first polarized light is the same, and/or

The backlight module further includes a sensor, wherein the sensor is configured to detect external light incident thereon and send out a signal,

The backlight module further includes at least one uniform light element, wherein the at least one uniform light element is arranged on a side of the direction control element away from the light source assembly.
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.
The backlight module according to claim 21, wherein the polarization conversion element is located on the side of the polarization splitting element away from the light source, on the side of the reflection element away from the light source, or on the side of the light source between the polarization splitting element and the reflective element.
The backlight module according to any one of claims 20-22, wherein the plurality of light source assemblies comprises a plurality of first light source assemblies and a plurality of second light source assemblies, and the plurality of first light source assemblies and the plurality of light source assemblies The plurality of second light source assemblies are arranged axisymmetrically with respect to the axis of symmetry, and are respectively located on both sides of the axis of symmetry, and the sensor is located between the plurality of first light source assemblies and the plurality of second light source assemblies .
The backlight module according to claim 23, wherein the orthographic projection of the light source assembly on the plane where the sensor is located overlaps at least part of the sensor, and the at least part of the overlap can transmit external light.
The backlight module according to any one of claims 1-24, wherein, after the collimated light is processed by the direction control component, the divergence angle in the first direction is θ1, and the divergence angle in the second direction is is θ2, the length of the eye box area in the horizontal direction is h, and the length in the vertical direction is h', θ1≤arctanh/2D, θ2≤arctan h'/2D, D is the exit light of the backlight module from The propagation path length from the backlight module to the eye box area.
A head-up display device, comprising a display panel and a backlight module according to any one of claims 1-25.
The head-up display device according to claim 26, wherein the same eye box area of the head-up display device is configured to allow users in the driving position and the passenger position to view the virtual image of the head-up display device.
The head-up display device according to claim 26 or 27, wherein, after the collimated light is processed by the direction control component, the divergence angle in the first direction is θ1, and the divergence angle in the second direction is θ2, The length of the eye box area in the horizontal direction is h, the length in the vertical direction is h', θ1≤arctanh/2D, θ2≤arctan h'/2D, D is the outgoing light of the backlight module from the backlight The propagation path length of the module to the eye box area.
A head-up display device, comprising a display panel and the backlight module according to any one of claims 4-6, wherein the display panel is located at the light outlet of the lamp tube.
A vehicle, comprising the backlight module according to any one of claims 1-25 or the head-up display device according to any one of claims 26-29.