Backlight heat dissipation structure for HUD (Head Up Display)

Abstract

The utility model discloses a backlight heat radiation structure used for an HUD, comprising a support, a heat conduction aluminum substrate and an optical assembly, the support is provided with an accommodating cavity, and the bottom of the accommodating cavity is provided with a plurality of avoiding holes; a plurality of LED light bars are installed on the heat conduction aluminum substrate, and when the heat conduction aluminum substrate is arranged on one side face of the support, the LED light bars are correspondingly located in the receding holes respectively; the optical assembly comprises a light guide plate and an optical film, the light guide plate and the optical film are arranged in a stacked mode, the optical assembly is arranged in the containing cavity, and the LED lamp strips face the optical assembly. The LED lamp strip is installed on the heat conduction aluminum substrate, the LED lamp strip is rapidly led out through the heat conduction aluminum substrate, and therefore the heat dissipation effect of the LED lamp strip can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of HUD production and manufacturing, in particular to a backlight heat dissipation structure for HUD. Background Art

[0002] HUD (Head Up Display) is widely used in the automotive field. HUD technology projects images on the front windshield or other transparent surfaces, allowing drivers to obtain key information without lowering their heads, greatly improving driving safety and convenience. However, since its use environment requires visibility under strong light, the backlight brightness is usually required to be nearly 1 million mcd / m2. High brightness will also bring high power consumption, and the small space of HUD poses a great challenge to heat dissipation.

[0003] In view of the above, a backlight heat dissipation structure for HUD is proposed, so as to improve the heat dissipation effect of the backlight. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a backlight heat dissipation structure for a HUD, thereby being able to improve the heat dissipation effect of the backlight.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A backlight heat dissipation structure for a HUD comprises: a bracket, a heat-conducting aluminum substrate and an optical component, wherein the bracket is provided with a receiving cavity, and a plurality of avoidance holes are provided at the bottom of the receiving cavity; a plurality of LED light strips are mounted on the heat-conducting aluminum substrate, and when the heat-conducting aluminum substrate is arranged on a side surface of the bracket, each of the LED light strips is correspondingly located in each of the avoidance holes; the optical component comprises a light guide plate and an optical film, the light guide plate and the optical film are stacked, the optical component is arranged in the receiving cavity, and each of the LED light strips faces the optical component.

[0007] In one embodiment, a limiting protrusion is provided on the four side walls of the accommodating cavity, and the four sides of the optical component are abutted against the limiting protrusion.

[0008] In one embodiment, the bracket is a thermal insulation bracket, and the thermal conductivity of the thermal insulation bracket is 0.02-0.035W / m2.

[0009] In one embodiment, the thermal insulation bracket is a polyurethane bracket.

[0010] In one embodiment, the thermal insulation bracket is a polyphenylene bracket.

[0011] In one embodiment, the thermally conductive aluminum substrate is attached to a side surface of the bracket by double-sided adhesive.

[0012] In one embodiment, the double-sided adhesive tape is a high temperature resistant double-sided adhesive tape.

[0013] In one of the embodiments, a bracket mounting portion is provided on the bracket, a first mounting hole is opened on the bracket mounting portion, and a substrate mounting portion is also provided on the thermally conductive aluminum substrate, a second mounting hole is opened on the substrate mounting portion, and the first mounting hole and the second mounting hole are connected and fixed by a screw connection.

[0014] In one embodiment, the threaded connection member is a screw.

[0015] In one embodiment, the first mounting hole is a threaded hole, and the second mounting hole is also a threaded hole.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] 1. The backlight heat dissipation structure for HUD of the utility model installs the LED light bar on the thermally conductive aluminum substrate, and quickly conducts the heat of the LED light bar through the thermally conductive aluminum substrate, thereby improving the heat dissipation effect of the LED light bar.

[0018] 2. By setting the bracket as a heat-insulating bracket, the heat transfer from the thermally conductive aluminum substrate to the bracket is reduced, thereby preventing the heat from continuing to affect the bracket and the optical components in the bracket, so that the heat of the thermally conductive aluminum substrate can be conducted away from the bracket. For example, the heat is conducted away from the side of the thermally conductive aluminum substrate away from the LED light strip, so as to ensure the heat dissipation effect and increase the service life of the backlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0020] Figure 1 This is a schematic structural diagram of a backlight heat dissipation structure for HUD in one embodiment of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the front view structure of the bracket, the heat-conducting aluminum substrate and the LED light bar for the backlight heat dissipation structure of the HUD;

[0022] Figure 3 for Figure 1 A schematic diagram of the side view structure of the bracket, thermal conductive aluminum substrate and LED light bar for the backlight heat dissipation structure of the HUD; DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0024] See also Figure 1 , Figure 2 and Figure 3 As shown, a backlight heat dissipation structure 10 for HUD includes: a bracket 100, a thermally conductive aluminum substrate 200 and an optical component 300. The bracket 100 is provided with a receiving cavity 110, and a plurality of avoidance holes 111 are provided at the bottom of the receiving cavity 110; a plurality of LED light strips 400 are mounted on the thermally conductive aluminum substrate 200, and when the thermally conductive aluminum substrate 200 is disposed on a side surface of the bracket 100, each LED light strip 400 is correspondingly located in each avoidance hole 111; the optical component 300 includes a light guide plate 310 and an optical film 320, and the light guide plate 310 and the optical film 320 are stacked, and the optical component 300 is disposed in the receiving cavity 110, and each LED light strip 400 faces the optical component 300.

[0025] It should be noted that the backlight heat source of the display screen mainly comes from the LED light bar. Usually, the LED light is fixed on the circuit board. The thermal conductivity of the ordinary PCB (printed circuit board) and FPC (flexible circuit board) is weak. Therefore, in the present invention, in order to improve the heat dissipation effect of the LED light bar 400, the LED light bar is installed on the thermal conductive aluminum substrate 200, and the heat conduction efficiency is improved by the thermal conductive aluminum substrate 200. The optical film 320 includes a light enhancement film and a diffusion film.

[0026] In one embodiment, a limiting protrusion 112 is provided on the surrounding side walls of the accommodating cavity 110, and the surroundings of the optical component 300 are abutted against the limiting protrusion 112. The limiting protrusion 112 supports and limits the optical component 300, so that a certain space distance is left between the optical component 300 and the LED light bar 400, so as to ensure that the LED light bar 400 can be more evenly irradiated to the light guide plate 310, and light is guided by the light guide plate 310, so that the emission of the light source is more uniform.

[0027] Furthermore, in the present invention, it is also necessary to explain that the heat transfer paths of the thermally conductive aluminum substrate mainly include: 1. heat convection exchange between the thermally conductive aluminum substrate and the outside air (if necessary, a fan can be added to the backlight heat dissipation structure to improve the heat dissipation effect); 2. heat radiation between the thermally conductive aluminum substrate and the outside air; 3. heat conduction between the thermally conductive aluminum substrate and the bracket; 4. heat exchange between the thermally conductive aluminum substrate and the air in the accommodating cavity. The heat conduction between the thermally conductive aluminum substrate and the bracket, as well as the heat exchange between the thermally conductive aluminum substrate and the air in the accommodating cavity, will further affect the optical components inside the backlight. Therefore, in order to further reduce the heat of the thermally conductive aluminum substrate and continue to conduct heat to the bracket and the accommodating cavity, in the present invention, the bracket 100 is a heat-insulating bracket, and the thermal conductivity of the heat-insulating bracket is 0.02-0.035W / m2. The lower the thermal conductivity of the bracket 100, the better the thermal insulation effect. The thermal insulation bracket reduces the heat from the thermally conductive aluminum substrate to continue to be conducted to the bracket, thereby achieving a thermal insulation effect, so that the heat of the thermally conductive aluminum substrate is conducted to the back of the thermally conductive aluminum substrate as much as possible, reducing the impact of heat on the optical components in the backlight.

[0028] In addition, it should be noted that, in order to avoid the LED light strip on the back, the bottom of the accommodating cavity of the traditional bracket usually adopts a fully open hole structure, which will lead to a reduction in the contact area between the bracket and the thermally conductive aluminum substrate. Therefore, in the utility model, by opening an avoidance hole 111 in the accommodating cavity, the avoidance hole 111 only avoids the LED light strip, and other areas still retain the contact between the bracket body and the thermally conductive aluminum substrate, thereby further increasing the contact area between the bracket and the thermally conductive aluminum substrate, that is, further improving the thermal insulation effect and reducing the heat conduction toward the bracket.

[0029] Preferably, the heat insulating bracket is a polyurethane bracket. Or preferably, the heat insulating bracket is a polystyrene bracket. The polyurethane bracket and the polystyrene bracket have better heat insulation effect. The thermal conductivity of the bracket is reduced, so the temperature transferred from the heat conductive aluminum substrate to the inner side of the bracket can be reduced, so the heat flux density through the bracket direction is reduced, so that the heat will be dissipated from the other side to the air through the heat conductive aluminum substrate, thereby improving the heat dissipation effect.

[0030] In one embodiment, the heat-conducting aluminum substrate is attached to one side of the bracket by double-sided adhesive. The heat-conducting aluminum substrate and the bracket are connected and fixed by double-sided adhesive. Preferably, the double-sided adhesive is high-temperature resistant double-sided adhesive.

[0031] See also Figure 2As shown, in one embodiment, a bracket mounting portion 120 is provided on the bracket 100, and a first mounting hole 121 is provided on the bracket mounting portion 120, and a substrate mounting portion is also provided on the thermally conductive aluminum substrate 200, and a second mounting hole is provided on the substrate mounting portion, and the first mounting hole 121 and the second mounting hole are connected and fixed by a screw connection. For example, the screw connection is a screw, and the first mounting hole 121 and the second mounting hole are connected by a screw connection. For example, the first mounting hole 121 is a threaded hole, and the second mounting hole is also a threaded hole, so that it is convenient to connect and fix by a screw connection. The bracket mounting portion 120 and the substrate mounting portion are respectively provided with two locations to improve the stability of the installation.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A backlight heat dissipation structure for HUD, characterized in that: include: A bracket, wherein a receiving cavity is formed on the bracket, and a plurality of avoidance holes are formed at the bottom of the receiving cavity; A heat-conducting aluminum substrate, on which a plurality of LED light strips are mounted, and when the heat-conducting aluminum substrate is disposed on one side of the bracket, each of the LED light strips is correspondingly located in each of the avoidance holes; and An optical component includes a light guide plate and an optical film, the light guide plate and the optical film are stacked, the optical component is disposed in the accommodating cavity, and each of the LED light strips faces the optical component.

2. The backlight heat dissipation structure for HUD according to claim 1, characterized in that: The side walls around the accommodating cavity are provided with limiting protrusions, and the four sides of the optical component are abutted against the limiting protrusions.

3. The backlight heat dissipation structure for HUD according to claim 1, characterized in that: The bracket is a heat-insulating bracket, and the thermal conductivity of the heat-insulating bracket is 0.02-0.035W / m2.

4. The backlight heat dissipation structure for HUD according to claim 3, characterized in that: The heat insulation bracket is a polyurethane bracket.

5. The backlight heat dissipation structure for HUD according to claim 3, characterized in that: The thermal insulation bracket is a polyphenyl bracket.

6. The backlight heat dissipation structure for HUD according to claim 1, characterized in that: The heat-conducting aluminum substrate is attached to one side surface of the bracket by double-sided bonding.

7. The backlight heat dissipation structure for HUD according to claim 6, characterized in that: The double-sided adhesive tape is high temperature resistant double-sided adhesive tape.

8. The backlight heat dissipation structure for HUD according to claim 1, characterized in that: The bracket is provided with a bracket mounting portion, and the bracket mounting portion is provided with a first mounting hole. The thermally conductive aluminum substrate is also provided with a substrate mounting portion, and the substrate mounting portion is provided with a second mounting hole. The first mounting hole and the second mounting hole are connected and fixed by a screw connection.

9. The backlight heat dissipation structure for HUD according to claim 8, characterized in that: The screw connection member is a screw.

10. The backlight heat dissipation structure for HUD according to claim 8, characterized in that: The first mounting hole is a threaded hole, and the second mounting hole is also a threaded hole.

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