Backlight module

Abstract

The embodiment of the utility model belongs to the technical field of backlight. The utility model further relates to a backlight module which comprises a heat dissipation piece, an aluminum substrate is arranged on the heat dissipation piece, a plurality of lamp beads are installed on the aluminum substrate, an infrared cut-off filter is installed between the aluminum substrate and the tops of the lamp beads, and the infrared cut-off filter is used for cutting off infrared light waves. The heat dissipation piece is matched with the aluminum substrate to be used for dissipating heat of the lamp beads to the outside. According to the HUD, the heat dissipation piece and the aluminum substrate are arranged, the aluminum substrate and the heat dissipation piece are connected together, the heat dissipation piece can cool and dissipate heat for the lamp beads through the aluminum substrate, the situation that devices in the HUD are damaged due to heat accumulation is reduced, only light of 380-740 nm passes through the infrared cut-off optical filter, light of other wavelengths is cut off and cannot pass through the infrared cut-off optical filter, and therefore the heat dissipation effect of the HUD is improved. Therefore, even in a full-bright white picture, the infrared light wave generating heat can be effectively cut off, so that the diaphragm on the white picture cannot be damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of backlight, and more specifically, to a backlight module. Background Art

[0002] The HUD system, or Head Up Display, is also known as the head-up display system. The main function of this system is to project important driving information such as speed and navigation onto the windshield in front of the driver, so that the driver can view this information without lowering or turning his head during driving, thereby improving driving safety and convenience. The HUD system was first used in the aviation field. It can project key flight information such as the aircraft's speed, altitude, heading, and descent rate onto the pilot's helmet or windshield in real time, helping the pilot maintain precise control of the flight status in a complex flight environment. In recent years, the HUD system has also been widely used in the automotive field, and is experiencing rapid development with the rise of AR technology and significant improvements in HUD display effects and costs.

[0003] The HUD system needs to be able to read the displayed content under the midday sun, so the brightness of the image reaching the eye needs to be between 3000 and 4000 nits. However, the HUD uses a TFT module as an image source, and the transmittance of TFT is only between 7% and 8%. In addition, the HUD uses the front windshield as a reflector, and the reflectivity of the front windshield is also around 8%. The brightness of the HUD light source system must reach 600,000 nits. A 600,000 nit light source generates a lot of heat when it emits light, which can damage the devices in the HUD and cause fires in severe cases. Therefore, we have made improvements to this and proposed a backlight module.

[0004] For example, a Chinese patent (publication number: CN208521082U) discloses a backlight device for a HUD head-up display, and its specification discloses: With the development of technology, head-up displays are now gradually used in automobiles and other fields. Head-up displays on the market now usually use point light sources as their backlight devices, but the problem of high heat generation, excessively concentrated heat generation, and uneven light emission from point light sources is something that needs to be solved in the industry. The above problems can prove the defects of the existing technology. Utility Model Content

[0005] The technical problem to be solved by the embodiments of the utility model is that a light source generates a large amount of heat when emitting light, and this heat can damage the components in the HUD and even cause a fire in serious cases.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A backlight module includes: a heat sink, an aluminum substrate is arranged on the heat sink, a plurality of lamp beads are installed on the aluminum substrate, an infrared cut-off filter is installed between the aluminum substrate and the tops of the plurality of lamp beads, the infrared cut-off filter is used to cut off infrared light waves, and the heat sink and the aluminum substrate cooperate to dissipate the heat of the lamp beads to the outside.

[0008] As an improved method of the utility model, the heat sink includes a support frame installed on a side of the aluminum substrate away from the infrared cutoff filter, a first air outlet is opened on a side of the support frame close to the aluminum substrate, and a heat dissipation fan is arranged in the support frame.

[0009] As an improvement of the utility model, a first lens plate is fixedly mounted on a side of the infrared cutoff filter away from the aluminum substrate, and a plurality of lens bodies are embedded on the first lens plate, and the positions of the plurality of lens bodies correspond to the positions of a plurality of lamp beads respectively.

[0010] As an improvement of the utility model, a frosted light-evening film is installed on a side of the first lens plate away from the infrared cut-off filter, and the frosted light-evening film is used for light evenness of the lamp beads.

[0011] As an improvement of the utility model, a second lens plate is installed on the side of the frosted light-homogenizing film away from the first lens plate, and a plurality of Fresnel thin lenses are embedded on the second lens plate. The positions of the plurality of Fresnel thin lenses correspond to the positions of a plurality of lamp beads.

[0012] As an improved manner of the present invention, a prism film is provided on a side of the second lens plate away from the frosted light-homogenizing film.

[0013] As an improvement of the utility model, a protective part is arranged between the outer surfaces of the support frame, the aluminum substrate, the infrared cutoff filter, the first lens plate, the frosted light-homogenizing film, the second lens plate and the prism film, and the protective part is used for protecting the support frame, the aluminum substrate, the infrared cutoff filter, the first lens plate, the frosted light-homogenizing film, the second lens plate and the prism film.

[0014] As an improvement of the utility model, the protective part includes a fixed bracket, which is connected between the support frame, the aluminum substrate, the infrared cutoff filter, the first lens plate, the frosted light-homogenizing film, the second lens plate and the outer side of the prism film, and the bottom of the fixed bracket is open.

[0015] As an improved manner of the utility model, a plurality of second air outlets are provided on the outer peripheral side of the fixed bracket, and the second air outlets are used to cooperate with the first air outlets to realize the heat dissipation to the outside.

[0016] As an improved method of the utility model, a diaphragm is provided on the top of the fixed bracket

[0017] Compared with the prior art, the embodiments of the present invention mainly have the following beneficial effects:

[0018] In order to solve the problem in the prior art that a large amount of heat is generated when the light source emits light, and this heat will damage the devices in the HUD and even cause a fire in severe cases, the present application provides a heat sink and an aluminum substrate, and the aluminum substrate is connected to the heat sink, so that the heat sink can cool the lamp beads through the aluminum substrate to reduce the damage to the devices in the HUD caused by heat accumulation. The infrared cutoff filter only passes light of 380nm~740nm, and cuts off light of other wavelengths, preventing it from passing. In this way, even in a fully bright white screen, the infrared light waves that generate heat will be effectively cut off, so that the membrane above it will not be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the backlight module provided in this application;

[0020] Figure 2 An exploded view of the backlight module provided for this application;

[0021] Figure 3 A schematic diagram of the structure of the prism film of the backlight module provided in this application;

[0022] Figure 4 The backlight module provided in this application Figure 1 Schematic diagram of the structure viewed from above;

[0023] Figure 5 A schematic diagram of the structure of the aperture and fixing bracket of the backlight module provided in this application;

[0024] Figure 6 This is a schematic diagram of the structure of the fixing bracket of the backlight module provided in this application.

[0025] Indicated in the figure:

[0026] 1. Support frame; 101. First air outlet; 103. Cooling fan; 2. Aluminum substrate; 201. Lamp beads; 3. Infrared cutoff filter; 4. First lens plate; 401. Lens body; 5. Frosted light-homogenizing film; 6. Second lens plate; 601. Fresnel thin lens; 7. Prism film; 8. Aperture; 9. Fixed bracket; 901. Second air outlet. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Reference to "embodiments" herein means that specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] As mentioned in the background technology, the HUD system needs to be able to read the displayed content under the midday sun, so the brightness of the image reaching the eye needs to be between 3000 and 4000 nits; and the HUD uses a TFT module as an image source, the transmittance of TFT is only between 7 and 8%, and the HUD uses the front windshield as a reflector, the reflectivity of the front windshield is also around 8%, and the brightness of the HUD light source system must reach 600,000 nits. A 600,000 nit light source generates a lot of heat when it emits light, which will damage the components in the HUD and cause a fire in serious cases.

[0029] In order to solve this technical problem, the utility model provides a backlight module, which is applied to a HUD system.

[0030] Specifically, please refer to Figure 1-Figure 4 , the backlight module specifically includes:

[0031] A heat sink is provided with an aluminum substrate 2, on which a plurality of lamp beads 201 are mounted, and between the aluminum substrate 2 and the top of the plurality of lamp beads 201 an infrared cutoff filter 3 is installed, the infrared cutoff filter 3 is used for cutting off infrared light waves, and the heat sink and the aluminum substrate 2 cooperate to dissipate the heat of the lamp beads 201 to the outside.

[0032] The backlight module provided by the utility model is connected with the heat sink and the aluminum substrate 2, so that the heat sink can cool and dissipate heat for the lamp beads 201 through the aluminum substrate 2 to reduce the damage to the components in the HUD caused by heat accumulation. The infrared cutoff filter 3 only passes the light of 380nm~740nm, and cuts off the light of other wavelengths and does not let it pass. In this way, even in a fully bright white screen, the infrared light waves that generate heat will be effectively cut off, so that the membrane above it will not be damaged.

[0033] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] Embodiment 1 of the backlight module of the utility model

[0037] like Figure 1-Figure 4 As shown, the backlight module of the utility model includes: a heat sink, an aluminum substrate 2 is arranged on the heat sink, a plurality of lamp beads 201 are installed on the aluminum substrate 2, an infrared cutoff filter 3 is installed between the aluminum substrate 2 and the top of the plurality of lamp beads 201, the infrared cutoff filter 3 is used to cut off infrared light waves, the heat sink and the aluminum substrate 2 are used to dissipate the heat of the lamp beads 201 to the outside, so that the heat sink can cool and dissipate the heat for the lamp beads 201 through the aluminum substrate 2 to reduce the damage to the components in the HUD caused by heat accumulation, the infrared cutoff filter 3 only passes the light of 380nm~740nm, and cuts off the light of other wavelengths and does not let it pass, so that even in a fully bright white screen, the infrared light waves that generate heat will be effectively cut off, so that the diaphragm above it will not be damaged.

[0038] Further, such as Figure 2 As shown, the heat sink includes a support frame 1 installed on a side of the aluminum substrate 2 away from the infrared cutoff filter 3, a first air outlet 101 is provided on a side of the support frame 1 close to the aluminum substrate 2, and a cooling fan 103 is arranged in the support frame 1. The cooperation between the first air outlet 101 and the cooling fan 103 can improve the efficiency of heat exchange between the aluminum substrate 2 and the outside world, so that the heat generated by the lamp bead 201 can be discharged to the outside world through the aluminum substrate 2, the first air outlet 101 and the cooling fan 103, thereby reducing the influence of heat accumulation on the operation of the HUD system.

[0039] Embodiment 2 of the backlight module of the utility model

[0040] like Figure 2As shown, the backlight module of the utility model further has a first lens plate 4 fixedly mounted on one side of the infrared cutoff filter 3 away from the aluminum substrate 2, and a plurality of lens bodies 401 are embedded on the first lens plate 4, and the positions of the plurality of lens bodies 401 respectively correspond to the positions of a plurality of lamp beads 201, and the first lens plate 4 can support the lens bodies 401, and the lens bodies 401 can collimate and evenly distribute the light generated by the lamp beads 201, thereby reducing light loss.

[0041] Further, such as Figure 2 As shown, a frosted light-homogenizing film 5 is installed on one side of the first lens plate 4 away from the infrared cutoff filter 3. The frosted light-homogenizing film 5 is used for light homogenization of the lamp beads 201. The light homogenization effect of the frosted light-homogenizing film 5 is mainly reflected in its ability to diffuse light, causing the light to scatter when passing through the surface of the film, thereby achieving uniform distribution of light. This scattering process helps to reduce the concentration and reflection of light, making the light display more uniform and soft, making the light a uniform surface light source, and achieving the effect of optical diffusion.

[0042] Further, such as Figure 2 As shown, a second lens plate 6 is installed on the side of the frosted light-homogenizing film 5 away from the first lens plate 4, and a plurality of Fresnel thin lenses 601 are embedded on the second lens plate 6. The positions of the plurality of Fresnel thin lenses 601 correspond to the positions of the plurality of lamp beads 201 respectively. The Fresnel thin lens 601 is mainly made of polyolefin material by injection molding, and is also made of glass. One side of the lens surface is a smooth surface, and the other side is engraved with concentric circles from small to large. This texture design is based on the requirements of light interference, diffraction, relative sensitivity and receiving angle; the principle of the Fresnel thin lens 601 is mainly based on the curvature and refraction principle of the lens surface. When the light passes through the Fresnel thin lens 601, each concentric ring will focus or diffuse the light, thereby realizing specific processing of the light, such as focusing parallel light into a point, or diffusing the light of a point into a piece; the Fresnel thin lens 601 can concentrate light, improve the lighting brightness and high beam effect, or make the light more uniform, improve the lighting range and safety performance.

[0043] Further, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a prism film 7 is provided on one side of the second lens plate 6 away from the frosted light-homogenizing film 5. The light-homogenizing effect of the prism film 7 is mainly reflected in its special optical structure. A microscopic prism array structure is provided on its surface. This structure can utilize optical principles such as refraction, total reflection, and light accumulation to concentrate light from all directions toward the central viewing angle. Specifically, when light passes through the prism film 7, its special prism structure allows light of a specific angle to be emitted, usually at an angle of about 35° with the z-axis, while those light rays that do not meet the emission angle will be restricted by the structure of the prism film 7 and cannot be emitted directly. In this way, the prism film 7 can effectively regulate the light, so that more light is concentrated on the central viewing angle, thereby increasing the brightness and controlling the viewing angle. This light-homogenizing effect not only increases the brightness, but also makes the visual effect more uniform.

[0044] Embodiment 3 of the backlight module of the utility model

[0045] like Figure 5-Figure 6 As shown, the backlight module of the utility model further has a protective portion arranged between the outer surfaces of the support frame 1, the aluminum substrate 2, the infrared cutoff filter 3, the first lens plate 4, the frosted light-homogenizing film 5, the second lens plate 6 and the prism film 7. The protective portion is used for protecting the support frame 1, the aluminum substrate 2, the infrared cutoff filter 3, the first lens plate 4, the frosted light-homogenizing film 5, the second lens plate 6 and the prism film 7 to reduce the situation where the support frame 1, the aluminum substrate 2, the infrared cutoff filter 3, the first lens plate 4, the frosted light-homogenizing film 5, the second lens plate 6 and the prism film 7 are hit by external forces.

[0046] Further, such as Figure 6 As shown, the protective part includes a fixed bracket 9, which is connected between the support frame 1, the aluminum substrate 2, the infrared cutoff filter 3, the first lens plate 4, the frosted light-homogenizing film 5, the second lens plate 6 and the outer side of the prism film 7, and the bottom of the fixed bracket 9 is open, and the position of the opening corresponds to the position of the cooling fan 103, so as to facilitate the operation of the cooling fan 103.

[0047] Further, such as Figure 5-Figure 6 As shown, a plurality of second air vents 901 are provided on the outer peripheral side of the fixing bracket 9 , and the second air vents 901 are used to cooperate with the first air vents 101 to dissipate heat to the outside.

[0048] Further, such as Figure 5-Figure 6 As shown, an aperture 8 is provided on the top of the fixed bracket 9, and the aperture 8 is mainly used to control the propagation direction and distribution of light. By accurately adjusting the size and shape of the aperture 8, the light emitted by the lamp bead 201 can be accurately controlled to achieve the desired lighting effect and brightness distribution.

[0049] When in use, the light emitted by the lamp bead 201 is processed by the infrared cutoff filter 3, the lens body 401, the frosted light-homogenizing film 5, the Fresnel thin lens 601 and the prism film 7 in sequence and then emitted from the aperture 8. During this process, the cooling fan 103, the first air outlet 101 and the second air outlet 901 cooperate with the aluminum substrate 2 to discharge the heat generated by the lamp bead 201 during operation to the outside.

[0050] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A backlight module, characterized in that: include: A heat sink, wherein an aluminum substrate (2) is disposed on the heat sink, a plurality of lamp beads (201) are mounted on the aluminum substrate (2), an infrared cutoff filter (3) is mounted between the aluminum substrate (2) and the tops of the plurality of lamp beads (201), the infrared cutoff filter (3) is used for cutting off infrared light waves, and the heat sink and the aluminum substrate (2) cooperate to dissipate heat from the lamp beads (201) to the outside.

2. The backlight module according to claim 1, characterized in that: The heat sink comprises a support frame (1) mounted on a side of the aluminum substrate (2) away from the infrared cut-off filter (3), a first air outlet (101) is provided on a side of the support frame (1) close to the aluminum substrate (2), and a heat dissipation fan (103) is arranged inside the support frame (1).

3. The backlight module according to claim 2, characterized in that: A first lens plate (4) is fixedly mounted on a side of the infrared cutoff filter (3) away from the aluminum substrate (2), and a plurality of lens bodies (401) are embedded on the first lens plate (4), wherein the positions of the plurality of lens bodies (401) respectively correspond to the positions of the plurality of lamp beads (201).

4. The backlight module according to claim 3, characterized in that: A frosted light-homogenizing film (5) is mounted on a side of the first lens plate (4) away from the infrared cut-off filter (3), and the frosted light-homogenizing film (5) is used for balancing light of the lamp beads (201).

5. The backlight module according to claim 4, characterized in that: A second lens plate (6) is mounted on a side of the frosted light-homogenizing film (5) away from the first lens plate (4), and a plurality of Fresnel thin lenses (601) are embedded on the second lens plate (6), wherein the positions of the plurality of Fresnel thin lenses (601) respectively correspond to the positions of the plurality of lamp beads (201).

6. The backlight module according to claim 5, characterized in that: A prism film (7) is provided on a surface of the second lens plate (6) away from the frosted light-homogenizing film (5).

7. The backlight module according to claim 6, characterized in that: A protective portion is provided between the outer surfaces of the support frame (1), the aluminum substrate (2), the infrared cutoff filter (3), the first lens plate (4), the frosted light-homogenizing film (5), the second lens plate (6) and the prism film (7), and the protective portion is used to protect the support frame (1), the aluminum substrate (2), the infrared cutoff filter (3), the first lens plate (4), the frosted light-homogenizing film (5), the second lens plate (6) and the prism film (7).

8. The backlight module according to claim 7, characterized in that: The protection part comprises a fixed bracket (9), wherein the fixed bracket (9) is connected between the support frame (1), the aluminum substrate (2), the infrared cut-off filter (3), the first lens plate (4), the frosted light-homogenizing film (5), the second lens plate (6) and the outer side of the prism film (7), and the bottom of the fixed bracket (9) is open.

9. The backlight module according to claim 8, characterized in that: A plurality of second air outlets (901) are provided on the outer peripheral side of the fixed bracket (9), and the second air outlets (901) are used to cooperate with the first air outlets (101) to dissipate heat to the outside.

10. The backlight module according to claim 9, characterized in that: A diaphragm (8) is provided on the top of the fixed bracket (9).

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