CN220020054U - Backlight display module, head-up display device and automobile - Google Patents

Abstract

The utility model discloses a backlight display module, comprising: a light emitting assembly including a substrate and a plurality of light emitting elements for emitting light; the light guide piece is provided with a plurality of reflecting cavities, the light guide piece is arranged on the surface of the substrate, and the light-emitting element is positioned in the corresponding reflecting cavity; the collimation piece is arranged on one side of the light guide piece, which is away from the light-emitting component; the light homogenizing piece is arranged on one side of the collimating piece, which is away from the light guide piece; the display element is arranged on one side of the dodging piece, which is away from the collimating piece. The reflection cavity is used for collecting and utilizing all the light rays emitted by the light-emitting element, so that the light efficiency and the display brightness of the backlight display module are improved; the light emitted by the light-emitting element is collimated and compressed through the collimating element, and the display element has higher display brightness; the light guide piece and the collimation piece are matched for use, so that the heat dissipation performance of the backlight display module is better; the light homogenizing piece makes the illumination light irradiated on the display element more uniform, so that the seam phenomenon is reduced, and the display effect is improved. The utility model also discloses a head-up display device and an automobile.

Description

Backlight display module, head-up display device and automobile

Technical Field

The utility model relates to the technical field of head-up display, in particular to a backlight display module, a head-up display device and an automobile.

Background

The head-Up Display (HUD) can map important information on the windshield of the automobile, so that a driver can see the important information without lowering the head, and driving safety is improved. Currently, HUDs are widely used in automobiles, and the optical part in the HUD mainly comprises an imaging light path and an image generating unit, wherein the image generating unit can be a TFT-LCD (thin film transistor liquid crystal display ), a DLP (digital light processing, digital Light Processing) or an LCOS (liquid crystal on silicon ), and the TFT-LCD has been widely used due to its technical maturity and low cost. The TFT-LCD is used as a non-self-luminous display screen, and an additional light source device is required to provide backlight for the TFT-LCD, and generally an LED (light-emitting diode) is used as a backlight source of the TFT-LCD, and most of the TFT-LCD backlights in HUDs in the market adopt a scheme of a collimating lens array.

However, since the light beams emitted by the LEDs are approximately lambertian, the general collimating lens array only can collect light at a certain angle, but the light at a large angle cannot be effectively utilized, so that the light efficiency of the backlight system is reduced, and stray light is generated to cause local bright spots on the display screen; and because the collimating lens array has inherent not enough, the light beam that adjacent LED sent overlaps in collimating lens array unit concatenation department, appears the piece phenomenon, influences the display effect, under the circumstances of backlight system low light efficiency simultaneously, in order to satisfy HUD virtual image end luminance's requirement, need increase LED's power or quantity, this can cause the too big problem of HUD complete machine power load, heat dissipation difficulty, even can make TFT-LCD display screen overload burn out when serious.

Disclosure of Invention

In view of the above, it is necessary to provide a backlight display module, a head-up display device and an automobile, so as to improve the light efficiency of the backlight display module, improve the display brightness of the backlight display module, reduce the seam phenomenon, improve the display effect and improve the heat dissipation performance.

The utility model provides a backlight display module, comprising:

the light-emitting assembly comprises a substrate and a plurality of light-emitting elements arranged on the surface of the substrate, and the light-emitting elements are used for emitting light;

the light guide piece is provided with a plurality of reflecting cavities, the reflecting cavities correspond to the light emitting elements one by one, the light guide piece is arranged on the surface of the substrate, the light emitting elements are positioned in the corresponding reflecting cavities, and the reflecting cavities are used for reflecting part of light rays emitted by the light emitting elements;

the collimating piece is arranged on one side of the light guide piece, which is away from the light emitting component, and is used for collimating the light rays emitted from the plurality of reflecting cavities of the light guide piece;

the light homogenizing piece is arranged on one side of the collimating piece, which is away from the light guide piece, and is used for homogenizing and modulating the light emitted by the collimating piece; a kind of electronic device with high-pressure air-conditioning system

The display element is arranged on one side of the light homogenizing piece, which is away from the collimating piece, and is used for displaying under the irradiation of the light emitted by the light homogenizing piece.

According to the backlight display module, the reflection cavity of the light guide piece can reflect part of the large-angle light rays emitted by the light emitting element, so that the light rays emitted by the light emitting element are all collected and utilized, the light efficiency of the backlight display module is effectively improved, meanwhile, the large-angle light rays can be compressed, and the display brightness of the backlight display module is improved; the collimation part is used for carrying out collimation compression on the light rays with small angles of the light-emitting element and the light rays with large angles reflected by the reflecting cavity of the light guide part, so that the display element has higher display brightness under the condition of the same dosage of the light-emitting element; the light guide piece and the collimation piece are matched for use, so that the light energy utilization efficiency of the backlight display module is improved, the consumption or driving power of the light-emitting element is reduced, and the heat dissipation performance of the backlight display module is better; the light emitted by the collimation piece is uniformly modulated through the light homogenizing piece, so that the illumination light irradiated on the display element is more uniform, the seam phenomenon of the light emitted by the light guide piece and the collimation piece is reduced, and the display effect is improved.

In one embodiment, the reflective cavity includes an inlet proximate to the substrate and an outlet distal to the substrate, the inlet having a cross-sectional area that is smaller than a cross-sectional area of the outlet in a direction parallel to the substrate surface.

According to the backlight display module, the sectional area of the inlet of the reflection cavity is smaller than the sectional area of the outlet, so that the reflection cavity can reflect large-angle light rays emitted by the light-emitting element and reflect the light rays towards the outlet, the light guide piece can form a surface light source, and the light efficiency of the backlight display module is improved.

In one embodiment, the cross-section of the reflecting cavity is trapezoid or arc along the direction vertical to the surface of the substrate; and/or the inner wall of the reflecting cavity is provided with an aluminum film or a silver film for reflecting light rays.

According to the backlight display module, the reflection cavity can reflect the large-angle light rays by limiting the cross section shape of the reflection cavity, so that the large-angle light rays emitted by the light-emitting element are collected and utilized; and/or the inner wall of the reflecting cavity is provided with an aluminum film or a silver film so as to realize the effect of specularly reflecting light rays.

In one embodiment, the collimating element comprises a plurality of collimating lens units, the collimating lens units are in one-to-one correspondence with the reflecting cavities, and the surface shape of each collimating lens unit is a spherical surface, an aspherical surface or a free curved surface.

According to the backlight display module, the specific structure of the collimating component is limited, so that the collimating component can achieve the effect of collimating light rays.

In one embodiment, the surface of the light homogenizing element facing the collimating element and the surface of the light homogenizing element facing away from the collimating element are respectively provided with a microstructure, and the microstructure is a cylindrical lens cell array or a spherical lens cell array.

According to the backlight display module, the specific structure of the light homogenizing part is limited, so that the light homogenizing part can realize the effect of homogenizing light, and the phenomenon of joint between the light passing through the light guide part and the collimation part is reduced.

In one embodiment, the backlight display module further includes a diffusing member, where the diffusing member is disposed between the light homogenizing member and the display element, and is configured to diffuse light emitted from the light homogenizing member and make the diffused light irradiate to the display element.

According to the backlight display module, the diffusion piece is arranged between the light homogenizing piece and the display element, and the diffusion piece diffuses light rays emitted by the light homogenizing piece, so that the display element has a plurality of visual angles, and the visual angle of the display element is improved.

In one embodiment, the light emitting element is at least partially embedded within the substrate.

According to the backlight display module, the light-emitting element is at least partially embedded into the substrate, so that the thickness of the light-emitting assembly is reduced, and the backlight display module is thinned.

In one embodiment, the backlight display module further includes a stiffening plate, and the stiffening plate is disposed on a side of the substrate facing away from the light guide member.

Above-mentioned backlight unit, through setting up the stiffening plate in the base plate one side that deviates from the light guide spare, strengthen the intensity of base plate, avoid backlight unit to warp and lead to the base plate to appear breaking, short circuit etc. inefficacy in the use, in addition, can also dispel the heat to the base plate production at work, improve backlight unit's life.

In addition, the utility model also provides a head-up display device, which comprises the backlight display module set according to any one of the technical schemes.

According to the head-up display device, the reflection cavity of the light guide piece of the backlight display module can reflect part of the large-angle light rays emitted by the light emitting element, so that the light rays emitted by the light emitting element are all collected and utilized, the light efficiency of the backlight display module is effectively improved, meanwhile, the large-angle light rays can be compressed, and the display brightness of the backlight display module is improved; the collimation part is used for carrying out collimation compression on the light rays with small angles of the light-emitting element and the light rays with large angles reflected by the reflecting cavity of the light guide part, so that the display element has higher display brightness under the condition of the same dosage of the light-emitting element; the light guide piece and the collimation piece are matched for use, so that the light energy utilization efficiency of the backlight display module is improved, the consumption or driving power of the light-emitting element is reduced, and the heat dissipation performance of the head-up display device is better; the light emitted by the collimation piece is uniformly modulated through the light homogenizing piece, so that the illumination light irradiated on the display element is more uniform, the seam phenomenon of the light emitted by the light guide piece and the collimation piece is reduced, and the display effect is improved.

In addition, the utility model also provides an automobile, which comprises the head-up display device.

Above-mentioned car, because the new line display device has realized better display effect, the new line display effect of car that has new line display device is better, and the driver of being convenient for sees the information of new line display device mapping clearly, is favorable to promoting driving security.

Drawings

Fig. 1 is a schematic structural diagram of a backlight display module according to a first embodiment of the present utility model.

Fig. 2 is a top view of the light guide shown in fig. 1.

Fig. 3 is a schematic light path diagram of the backlight display module shown in fig. 1.

Fig. 4 is a schematic structural diagram of a backlight display module according to a second embodiment of the utility model.

Fig. 5 is a schematic view of an optical path of the backlight display module shown in fig. 4.

Fig. 6 is a schematic structural diagram of a backlight display module according to a third embodiment of the utility model.

Description of the main reference signs

Backlight display modules 1, 2, 3

Light emitting assembly 10, 210, 310

Base plate 12, 312

Light emitting element 14, 214, 314

Light guide 20, 220, 320

Reflective cavities 22, 222

Inlet 24

Outlet 26

Collimation member 30, 230

Collimator lens unit 32, 232

Light homogenizing member 40, 240

Microstructures 42, 242

Display element 50, 250

Diffusion member 260

Stiffening plate 370

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, it is to be noted that the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the two components can be connected in a mechanical mode, can be electrically connected or can be communicated with each other, can be directly connected, can be indirectly connected through an intermediate medium, and can be communicated with each other inside the two components or can be in interaction relation with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Some embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a backlight display module 1 is provided in a first embodiment of the present utility model, the backlight display module 1 can be applied to a head-up display device, and the backlight display module 1 can provide a high-brightness and high-uniformity backlight for the head-up display device. The backlight display module 1 comprises a light emitting assembly 10, a light guide 20, a collimation member 30, a dodging member 40 and a display element 50.

The light emitting assembly 10 includes a substrate 12 and a plurality of light emitting elements 14 disposed on a surface of the substrate 12, the plurality of light emitting elements 14 are arranged in an array on the surface of the substrate 12, the light emitting elements 14 are configured to emit light, and the light emitted by the light emitting elements 14 is approximately lambertian. The substrate 12 is provided with wiring for connecting the light emitting elements 14. Wherein the substrate 12 may be a printed circuit board (Printed Circuit Board, PCB) on which the individual light emitting elements 14 are bonded to obtain the light emitting assembly 10. In a specific arrangement, the light emitting element 14 emits white light, and the light emitting element 14 arranged at the same position on the substrate 12 may be a white LED, or may be a monochromatic LED such as red, green, blue, or an RGB LED. The RGB LEDs are respectively lightened through the time sequence control of the circuits on the printed circuit board, and white light is synthesized by utilizing the persistence effect of human eyes. In some embodiments, the plurality of light emitting elements 14 may also be at least partially embedded within the substrate 12. It will be appreciated that at least partially embedded in the substrate 12, including the light emitting element 14 being partially embedded in the substrate 12, i.e. a portion of the light emitting element 14 is embedded in the substrate 12 and another portion protrudes out of the substrate 12 as seen in a cross-section along the thickness direction of the substrate 12; it may also be included that the light emitting element 14 is completely embedded in the substrate 12, i.e. that the light emitting element is completely embedded in the substrate 12, as seen in a cross section along the thickness direction of the substrate 12, without protruding from the surface of the substrate 12. Thus, the thickness of the light emitting assembly 10 can be reduced to a certain extent, so that the backlight display module 1 is thinned.

The light guide 20 is provided with a plurality of reflective cavities 22, the reflective cavities 22 are in one-to-one correspondence with the light emitting elements 14, and the reflective cavities 22 are arranged on the light guide 20 in an array so as to be in one-to-one correspondence with the light emitting elements 14. The light guide 20 is disposed on the surface of the substrate 12 and is located on the same side of the substrate 12 as the plurality of light emitting elements 14, the plurality of light emitting elements 14 are respectively located in the corresponding reflective cavities 22, and the reflective cavities 22 are configured to reflect a portion of light emitted by the light emitting elements 14. Part of the light is a large-angle light emitted by the light emitting element 14, for example, the large-angle light is a light with an angle greater than 50 °, the light with an angle greater than 50 ° emitted by the light emitting element 14 is reflected at the inner wall of the reflective cavity 22, and other light (with an angle less than 50 °) emitted by the light emitting element 14 is directly emitted from the reflective cavity 22. When the reflecting cavity 22 is specifically arranged, the inner wall of the reflecting cavity is plated with an aluminum film, a silver film or other dielectric films capable of reflecting light rays in an electroplating mode, so that the mirror reflection function of the light rays is realized. Along the direction perpendicular to the surface of the substrate 12, the cross-section of the reflective cavity 22 is trapezoidal, the reflective cavity 22 is generally trapezoidal (refer to fig. 2) or is circular-table-shaped, and the reflective cavity 22 is a central symmetrical cavity, so that the light emitted by the light emitting element 14 can be more regularly and uniformly irradiated onto the collimating element 30. The reflective cavity 22 includes an entrance 24 near the substrate 12 and an exit 26 far from the substrate 12, and the cross-sectional area of the entrance 24 is smaller than the cross-sectional area of the exit 26 in a direction parallel to the surface of the substrate 12, so that the reflective cavity 22 can collect not only the light emitted from the light emitting elements 14 at a large angle, but also compress the light, thereby reducing the angle of the light impinging on the display element 50, and thus obtaining higher visual brightness for the same number of light emitting elements 14.

In some embodiments, the inner wall of the reflective cavity 22 may further be provided with a reflective element, for example, a mirror is provided on the inner wall of the reflective cavity 22, and the surface of the mirror may be a plane or a curved surface.

In some embodiments, the cross-sectional shape of the reflective cavity 22 may also be rectangular, arcuate, a combination of trapezoidal and rectangular, or a combination of arcuate and rectangular, wherein the reflective cavity 22 may be generally bowl-shaped when the cross-sectional shape of the reflective cavity 22 is arcuate. When the cross-sectional shape of the reflective cavity 22 is a combination of a trapezoid and a rectangle, i.e., the trapezoid is down, the rectangle is up, the smaller opening of the trapezoid is the entrance, and the opening of the rectangle away from the trapezoid is the exit. When the cross-sectional shape of the reflective cavity 22 is a combination of an arc and a rectangle, i.e., the arc is down and the rectangle is up, the smaller opening of the arc is the entrance and the opening of the rectangle away from the arc is the exit.

The collimating element 30 is disposed on a side of the light guiding element 20 facing away from the light emitting assembly 10, and the collimating element 30 is configured to collimate the light rays emitted from the plurality of reflective cavities 22 of the light guiding element 20, so that the light rays are emitted from the collimating element 30 substantially parallel to each other and perpendicular to the surface of the substrate 12. The collimating element 30 includes a plurality of collimating lens units 32, the plurality of collimating lens units 32 are arranged in an array, the plurality of collimating lens units 32 are in one-to-one correspondence with the plurality of reflecting cavities 22 and the plurality of light emitting elements 14, the surface of each collimating lens unit 32 can be a spherical surface, an aspherical surface or a free curved surface, and the collimating element 30 is made of plastic or optical glass. The surface shapes of the plurality of collimating lens units 32 may be all the same or partially the same, for example, the surface shapes of the collimating lens units 32 are all spherical, for example, the surface shape of one part of the collimating lens units 32 is spherical, and the surface shape of the other part of the collimating lens units 32 is aspherical, which can be flexibly set according to practical requirements.

The light homogenizing element 40 is disposed at a side of the collimating element 30 facing away from the light guiding element 20, and the light homogenizing element 40 is used for homogenizing the light emitted from the collimating element 30. The surface of the light homogenizing element 40 facing the collimating element 30 and the surface facing away from the collimating element 30 are both provided with microstructures 42, and the microstructures 42 may be cylindrical lens cell arrays or spherical lens cell arrays with consistent parameters, or non-periodic cylindrical lens cell arrays or spherical lens cell arrays. The light emitted by the light emitting element 14 is absorbed by the light guide 20 through the reflecting cavity 22 and the collimating element 30, and is collected and utilized, the collected light is irradiated to the light homogenizing element 40 from the collimating element 30 approximately in a manner of being parallel to each other and perpendicular to the surface of the substrate 12, and the light is scattered by the microstructure 42 on the surface of the light homogenizing element 40, and is redistributed in space, so that the phenomenon of joint between the light passing through the light guide 20 and the collimating element 30 is reduced, the light has the characteristics of high light efficiency and high uniformity, the display element 50 obtains backlight with high light efficiency and high uniformity, and meanwhile, the energy distribution of the light is more uniform after the light passes through the light homogenizing element 40, and the light incident into human eyes is softer. Due to the micro-structure 42 on the surface of the light homogenizing element 40, the light beam irradiated on the display element 50 has a certain divergence angle, so that a plurality of viewing angles of the display element 50 are ensured, and the visual angle of the display element 50 is improved. It can be understood that when the microstructure 42 is a cylindrical lens cell array, the sub-cells of the cylindrical lens cell array are different from the spherical or near-spherical microstructure of a general microlens array, and are mainly divided into a plano-convex shape and a plano-concave shape, and specifically include a plano-convex cylindrical surface, a plano-concave cylindrical surface, a biconvex cylindrical surface, a biconcave cylindrical surface, a meniscus cylindrical surface, an intersecting cylindrical surface, a special-shaped cylindrical surface, and the like. Due to the cylindrical surface structure of the cylindrical lens cell array surface, the cylindrical lens cell array can focus incident light on lines or change the aspect ratio of an image, stretch the image, and the cylindrical lens cell array can expand the incident light into linearity and simultaneously homogenize the energy of a light source along the expansion direction.

The display element 50 is disposed on a side of the light homogenizing element 40 facing away from the collimating element 30, and the display element 50 is used for displaying under the irradiation of the light emitted from the light homogenizing element 40. When specifically arranged, the display element 50 may be a TFT (Thin Film Transistor ) liquid crystal display, an LED display or an OLED display, so that the display element 50 has a better display effect.

In the backlight display module 1, please refer to the schematic light path diagram of the backlight display module 1 shown in fig. 3, wherein fig. 3 only illustrates the schematic light path diagram of one light emitting element 14, which is not limited to the embodiment of the utility model. The light emitted by the light emitting element 14 includes light rays of a large angle (as shown by solid arrows in fig. 3, the light rays are actually an abstract geometric form, the concept of light rays is introduced in the optical field for more abstract and visual representation of the propagation direction and propagation characteristics of light, the light rays shown in fig. 3 are merely exemplary and not representative of the light rays actually emitted by the light emitting element 14, in practice, the angles of the light rays emitted by the light emitting element 14 may include more angles than the few angles shown in fig. 3) and light rays of a small angle (as shown by dashed arrows in fig. 3), the light rays of a small angle do not contact the inner wall of the reflective cavity 22, the light rays of a small angle directly pass through the reflective cavity 22 and are incident on the corresponding collimating lens unit 32 of the collimating element 30, and the light rays of a large angle are incident on the corresponding collimating lens unit 32 of the collimating element 30 after at least one specular reflection on the inner wall of the reflective cavity 22. The plurality of collimating lens units 32 of the collimating element 30 collimate the light rays emitted from the plurality of reflecting cavities 22 of the light guiding element 20, so that the light rays are emitted from the collimating element 30 and irradiated to the light homogenizing element 40 in a manner of being approximately parallel to each other and perpendicular to the surface of the substrate 12 (wherein the light rays can undergo a seam phenomenon on passing through the light guiding element 20 and the collimating element 30). The light rays irradiated to the light homogenizing element 40 are scattered by the microstructure 42 on the surface of the light homogenizing element 40, are redistributed in space, are emitted from the light homogenizing element 40 in a form with a certain divergence angle and are irradiated to the display element 50, so that the display element 50 obtains high-light-efficiency and high-uniformity backlight, the display element 50 displays information under the irradiation of the light rays, and the light rays passing through the light homogenizing element 40 are redistributed in space, so that the joint phenomenon of the light rays is reduced, the irradiation on the display element 50 is more uniform and soft, the interference on the display image on the display element 50 is avoided, and the display effect of the display element 50 is improved. In addition, the light emitted by the light emitting element 14 is reflected by the reflective cavity 22 to become a surface light source light with large-angle radiation, which is beneficial to shortening the light mixing distance of the light and realizing the thinning of the backlight display module 1.

Referring to fig. 4, a second embodiment of the present utility model provides a backlight display module 2, and the backlight display module 2 provided by the second embodiment is similar to the backlight display module 1 provided by the first embodiment in structure, except that: the backlight display module 2 of the second embodiment further includes a diffusing member 260, the diffusing member 260 is disposed between the light homogenizing member 240 and the display element 250, and the diffusing member 260 is configured to further diffuse an outgoing angle of the light outgoing from the light homogenizing member 240, and make the diffused light irradiate to the display element 250, so as to further improve a visual angle of the display element 250. The light passing through the diffuser 260 is refracted, reflected and scattered, so that the direction of the light passing through the diffuser 260 is modified to achieve the effect of optical diffusion. When specifically provided, the diffuser 260 may be a diffuser plate, or a diffuser film.

In the above-mentioned backlight display module 2, please refer to the schematic light path diagram of the backlight display module 2 shown in fig. 5. The light emitted by the light emitting element 214 of the light emitting component 210 includes a light ray with a large angle (shown by a solid arrow in fig. 5) and a light ray with a small angle (shown by a dotted arrow in fig. 5), the light ray with the small angle does not contact the inner wall of the reflective cavity 222, the light ray with the small angle directly passes through the reflective cavity 222 and is incident on the corresponding collimating lens unit 232 of the collimating element 230, and the light ray with the large angle is incident on the corresponding collimating lens unit 232 of the collimating element 230 after at least one specular reflection occurs on the inner wall of the reflective cavity 222. The plurality of collimating lens units 232 of the collimating element 230 collimate the light rays exiting from the plurality of reflecting cavities 222 of the light guiding element 220, such that the light rays exit from the collimating element 230 and impinge on the light homogenizing element 240 in a manner substantially parallel to each other and perpendicular to the surface of the substrate 12. The light irradiated to the light homogenizing member 240 is scattered by the microstructure 242 on the surface of the light homogenizing member 240, is spatially redistributed, and is emitted from the light homogenizing member 240 in a form having a certain divergence angle and irradiated to the diffuser 260. After the light irradiated to the diffuser 260 is diffused by the diffuser 260, the light irradiates to the display element 250 in a further diffusing manner, so that the display element 250 obtains a further visual angle, and the use experience of a user is improved.

Referring to fig. 6, a third embodiment of the present utility model provides a backlight display module 3, and the backlight display module 3 provided by the third embodiment is similar to the backlight display module 1 provided by the first embodiment in structure, and is different in that: in the backlight display module 3 of the third embodiment, the light emitting element 314 of the light emitting component 310 is partially embedded into the substrate 312, so as to ensure the strength of the substrate 312, and the backlight display module 3 of the third embodiment further includes a reinforcing plate 370, where the reinforcing plate 370 is disposed on a side surface of the substrate 312 facing away from the light guide 320, and the reinforcing plate 370 can be fixed on the substrate 312 by means of glue adhesion or the like, so as to reinforce the strength of the substrate 312, and avoid failure such as open circuit and short circuit of a circuit on the substrate 312 caused by deformation of the backlight display module 3 in use, which more seriously causes the problem of breakage of the substrate 312. The reinforcing plate 370 may be a steel plate or a ceramic plate, so that the reinforcing plate 370 can radiate heat generated by the substrate 312 during operation to a certain extent while reinforcing the substrate 312, and the service life of the backlight display module 3 is prolonged.

The utility model also provides a head-up display device, which comprises the backlight display module 1 described in the first embodiment, the backlight display module 2 described in the second embodiment, the backlight display module 3 described in the third embodiment or the backlight display module described in any other combined embodiment, and the description is given taking the backlight display module 1 described in the first embodiment as an example. The head-up display device of the embodiment of the utility model directly maps the high-brightness, high-uniformity and soft image displayed by the backlight display module 1 to human eyes, or maps the high-brightness, high-uniformity and soft image displayed by the backlight display module 1 to human eyes through the reflecting device.

The utility model also provides an automobile, which comprises the head-up display device, wherein the head-up display device is arranged on the outer side and the inner side of an automobile windshield, or the head-up display device is arranged on a central console of the automobile. When the head-up display device is mounted on a center console of an automobile, a high-brightness, high-uniformity and soft image displayed by the backlight display module 1 is mapped to human eyes through a corresponding reflecting device, wherein the reflecting device can be an automobile windshield, and the reflecting device can also comprise devices with reflecting functions such as a concave reflecting mirror and the like.

In other embodiments, the head-up display device may be installed in a field where a head-up display function is required to be utilized, such as a ship, a high-speed rail, or the like.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. A backlight display module, comprising:

the light-emitting assembly comprises a substrate and a plurality of light-emitting elements arranged on the surface of the substrate, and the light-emitting elements are used for emitting light;

the light guide piece is provided with a plurality of reflecting cavities, the reflecting cavities correspond to the light emitting elements one by one, the light guide piece is arranged on the surface of the substrate, the light emitting elements are positioned in the corresponding reflecting cavities, and the reflecting cavities are used for reflecting part of light rays emitted by the light emitting elements;

the collimating piece is arranged on one side of the light guide piece, which is away from the light emitting component, and is used for collimating the light rays emitted from the plurality of reflecting cavities of the light guide piece;

the light homogenizing piece is arranged on one side of the collimating piece, which is away from the light guide piece, and is used for homogenizing and modulating the light emitted by the collimating piece; a kind of electronic device with high-pressure air-conditioning system

The display element is arranged on one side of the light homogenizing piece, which is away from the collimating piece, and is used for displaying under the irradiation of the light emitted by the light homogenizing piece.

2. The backlight display module as recited in claim 1 wherein the reflective cavity comprises an entrance proximate to the substrate and an exit distal from the substrate, the entrance having a cross-sectional area that is smaller than a cross-sectional area of the exit in a direction parallel to the substrate surface.

3. The backlight display module according to claim 1, wherein the cross-sectional shape of the reflective cavity is a trapezoid or an arc along a direction perpendicular to the surface of the substrate; and/or the inner wall of the reflecting cavity is provided with an aluminum film or a silver film for reflecting light rays.

4. The backlight display module as recited in claim 1 wherein the collimating element comprises a plurality of collimating lens units, the plurality of collimating lens units are in one-to-one correspondence with the plurality of reflecting cavities, and the surface shape of the collimating lens units is spherical, aspherical or free-form.

5. The backlight display module as claimed in claim 1 wherein the surface of the light homogenizing member facing the collimating member and the surface facing away from the collimating member are each provided with a microstructure, and the microstructure is a cylindrical lens cell array or a spherical lens cell array.

6. The backlight display module as claimed in claim 1 further comprising a diffuser disposed between the light homogenizing member and the display element for diffusing the light emitted from the light homogenizing member and irradiating the diffused light to the display element.

7. The backlight display module of claim 1, wherein the light emitting element is at least partially embedded within the substrate.

8. The backlight display module of claim 1, further comprising a stiffening plate disposed on a side of the substrate facing away from the light guide.

9. A head-up display device comprising a backlight display module as claimed in any one of claims 1 to 8.

10. An automobile comprising the head-up display device according to claim 9.